Fix image display on jupyter

This fix is for bug 
https://nexedi.erp5.net/bug_module/20160212-76EAAC/view?ignore_layout:int=1
where the image base64 string was only showing. The error in this case was that the `mime_type` of content code_result was not being updated by the kernel before display.

Reported by : @Tyagov 
Please review: @Tyagov @kirr 

For testing, you can use this jupyter instance with updated kernel running : 
https://[2001:67c:1254:e:8b::335d]:8888/tree

There are also some example notebooks in the aforementioned jupyter.

See merge request !47

This fix is for bug https://nexedi.erp5.net/bug_module/20160212-76EAAC/view?ignore_layout:int=1
where the image base64 string was only shoeing. The error in this case was that the mime_type
of content code_result was not being updated by the kernel before display.

Reported by : @ivan

To pick up kirr/gitlab-ce@32fa1180

/cc @kazuhiko, @jerome
/reviewed-by TrustMe

6a4e45c5 (gitlab: Sync sidekiq service launch with upstream) claimed to
sync sidekiq startup with upstream, but missed one upstream change in
between 8.2 and 8.4:

    https://gitlab.com/gitlab-org/omnibus-gitlab/commit/2eb7634f

My bad - I should have reviewed git log for

    https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/templates/default/sv-sidekiq-run.erb

and I did not noticed that change because I did not and just compared
queues list visually.

Pick it up.

/cc @kazuhiko, @jerome
/reviewed-by TrustMe (I hope)

This brings slapos gitlab port up to date with current stable gitlab
version 8.4, and teaches Unicorn startup script to wait a bit for
PostgreSQL to start and be ready, before unicorn startup proceeds.

/cc @kazuhiko
/somewhat-reviewed-by @jerome
/reviewed-on nexedi/slapos!44

  This changes were squashed into a single commit and it includes:

    - install slapos_configurator by default
    - Allow define ssl authentication for a certain zope family
    - Allow define custom zope path per zope family

  Those changes are originally written by Alain Takoudjou and rewrited by Rafael Monnerat

To pick up kirr/gitlab-ce@a5965b54.

  The local changes are not yet generic enough to be shared among stack, so
  Introduce local changes here better

  There is no strong reason to use git.erp5.org to test code anymore

  slapos.package is not an egg anymore, it's implementation was replaced by
    the usage of ansible with playbooks.

As it was outlined in 5a744de7 (gitlab: Compile assets on instantiation
and make sure DB is properly setup/migrated before unicorn runs) we are
performing DB initialization and migration in pre-action as part of
unicorn startup script. But that currently has one drawback:

    if all services start at the same time - e.g. both PostgreSQL and
    Unicorn - and that is a common scenario when SR is compiled and
    instantiated / started, PostgreSQL is usually not yet ready to
    process queries from Unicorn startup script, and first-time Unicorn
    startup fails.

Until now this problem was workarounded by manually starting unicorn
second time - after some time postgresql is started and ready. But why
do it manually, if we can do the same logic automatically. So fix it:

    in Unicorn startup script wait a bit (up to 5 seconds) for
    PostgreSQL to become ready.

/cc @kazuhiko, @jerome

This is a SR to build NayuOS binary images.
More info on https://www.nayuos.com and in the README.

Merging this recipe from a standalone repository was a decision made together with @kirr and @vpelletier.

Even though we do not use LFS objects, builds and build artifacts,
gitlab backups corresponding directories and recreates them upon
restore.

Current state is: the directories are living under Rails root - that is
in our gitlab-work/ inside instance, and since gitlab-work is recreated
almost on every re-instantiation if we'll have some content in that
directories - it will be lost.

Don't allow even a chance for that to happen and move what is designed
to hold data to under var/ .

NOTE we create shared/lfs-objects/ and shared/artifacts/ because if we
    do not have this dirs, gitlab backup fails. Upstream code just
    assumes the directories are there.

/cc @kazuhiko, @jerome

Upstream added `pages` and `elasticsearch` queues to sidekiq

    https://gitlab.com/gitlab-org/omnibus-gitlab/commit/be6844ff
    https://gitlab.com/gitlab-org/omnibus-gitlab/commit/801d6ed7

but since those queues are used for EE-only services we do not enable
them.

/cc @kazuhiko, @jerome

As gitlab-workhorse is now serving everything, it proxies unknown-to-it
requests to unicorn, and that returns redirect to /users/sign_in for
/non-existent, not 403.

Adjust the promise and just verify whether we can get /static.css

NOTE nginx promise now effectively depends on gitlab-workhorse being up
    and running - because nginx is now configured to be only an SSL
    terminator and all requests processing is done by gitlab-workhorse and
    services below it.

    If in the future we'll need a pure nginx-is-up promise, we can
    introduce something to nginx config and verify that particular http
    endpoint.

/cc @kazuhiko, @jerome

add `-documentRoot ...` argument to gitlab-workhorse start as upstream
started to do:

    https://gitlab.com/gitlab-org/omnibus-gitlab/commit/d769f751

( gitlab-workhorse now needs to know where document root is as it now
  serves all content - e.g. static files too

  this option was introduced here:

    https://gitlab.com/gitlab-org/gitlab-workhorse/commit/1a7009e4  )

/cc @kazuhiko, @jerome

I manually reviewed

    files/gitlab-config-template/gitlab.rb.template
    files/gitlab-cookbooks/gitlab/attributes/default.rb

from omnibus-gitlab 8.4.2+ce.0-3-g68d5ee8 and picked up changes:

- unicorn OOM killer memory limits were raised up (because gitlab is now
  more memory hungry according to talks on gitlab.com)

  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/f8ee4a19

- there is no default limit for nginx client_max_body_size - it just
  goes to gitlab-workhorse as is at any size

  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/78862837

/cc @kazuhiko, @jerome

Direct merge for gitconfig.erb from omnibus-gitlab did not brought up
updates.

pack.threads=1 and receive.fsckObjects=true picked up from
https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/files/gitlab-cookbooks/gitlab/attributes/default.rb
in 264d785a stay the same.

/cc @kazuhiko, @jerome

No changes.

/cc @kazuhiko, @jerome

- there is a section for gitlab pages, which we stub-out;

- there is no longer a need to add /raw/... handling to nginx - as
  now nginx is just an SSL terminator for gitlab-workhorse, all URL
  handling is done inside gitlab-workhorse and is dealt with ok by our
  patches.

- as now nginx does not directly connect to unicorn, there is no need to
  pass unicorn section to nginx's template.

/cc @kazuhiko, @jerome

Like wih gitlab configs, this does only pure merge. We will
slaposify / adjust to updates in the following patches.

/cc @kazuhiko, @jerome

Slapos'ify config updates brought by sync with omnibus-gitlab (see merge
in the previous patch). Changes:

- default visibility levels gone away (see merge commit and
  https://gitlab.com/gitlab-org/omnibus-gitlab/commit/b5ebbab3 )

- there are new settings for GitLab Pages and Elasticsearch, which are EE
  only and thus we do not support them.

- there are new settings for auxiliary cron-like jobs, which we do not
  support for now, since they are used either for CI (not supported by
  us) or EE features.

Configuration files that were synced, but did not changed are also
marked as updated, so it is easier to track their changes to upstream in
the future.

/cc @kazuhiko, @jerome

This does only pure merge. We will slaposify / adjust config and
corresponding md5sum in the following patches.

/cc @kazuhiko, @jerome

Like 8f945bd2 - pristine copy from omnibus 8.4.4+ce.0-0-g1680742.

Nothing changed at all - gitconfig.erb stays the same.

/cc @kazuhiko, @jerome

Like 61544d87 - pristine copy from omnibus 8.4.4+ce.0-0-g1680742.

Most of http handling is moving to gitlab-workhorse. Nginx remains only
as ssl terminator.

/cc @kazuhiko, @jerome

Like 6fd7b987 - pristine copy from omnibus 8.4.4+ce.0-0-g1680742.

The only change is in

    gitlab.yml

The following files stay the same:

    database.yml.erb
    gitlab-rails-config.ru.erb
    gitlab-shell-config.yml.erb
    rack_attack.rb.erb
    resque.yml.erb
    smtp_settings.rb.erb
    unicorn.rb.erb

/cc @kazuhiko, @jerome

Update GitLab software to

    - gitlab-ce 8.4 + NXD patches

      https://lab.nexedi.com/kirr/gitlab-ce/commits/8-4-nxd

    - gitlab-shell to 2.6.10 which now is pure upstream, as all NXD
      patches were merged.

    - gitlab-workhorse 0.6.X + NXD patches.

      https://lab.nexedi.com/kirr/gitlab-workhorse/commits/y/blobraw-3
      https://gitlab.com/gitlab-org/gitlab-workhorse/merge_requests/17

This only updates software and begins SR update to 8.4 - for now gitlab
instance becomes non-working -- we'll pull in configuration files
updates and fixups in the following patches.

/cc @kazuhiko, @jerome

slapos.recipe.cmmi executes command lines by line, so this build options
were ignored.

  older versions are failing on ARM arch.