Instead of having running test installing eggs with setuptools during `python setup.py test`, which fails for `caucase` because one of its dependency (namely `cryptography`) cannot be installed so easily, we want to install the dependencies via buildout, using the same installation methods than in the actual software profiles using our eggs.

What I initially believed would be a small change turned out to be a long journey, especially because of using a develop version of `slapos.recipe.cmmi` caused signature changes in the parts installed by this recipe ( `git`, `openssl` etc - some parts that takes a bit of time to install ) so I had to fight with the software being reinstalled each time. Even though the cases which leads to reinstallation are understood (this even involved fixing a bug in buildout nexedi/slapos.buildout!14 ), this is still the case. Some solutions are proposed in the commit message of f4b6eedafd52b0d64f8b2bd1b57c752e02c88a65 , but this reached a state where we can consider first merging with this known problem or discuss ways of improving that before merging if it's considered as blocking. Current state is that it takes one hour to re-install what has to be reinstalled and run the test suite on test runner.

Despite this issue, this approach already improve things, because:
 * `caucase` tests are running (and passing)
 * some `slapos.cookbook` are improved so that they reuse eggs from the buildout and do not install again eggs when the are run.
 *  ... and some other small cleanups

This depends on nexedi/erp5!619 on the `erp5.util` side.

/reviewed-on nexedi/slapos!309

This function factorize the code to instanciate a recipe in a fake
buildout.
The new feature is that if running in a buildout directory, the recipe
will reuse the eggs from this buildout instead of trying to install eggs
again.

we now use slapos.cookbook:wrapper instead

Instead of letting `python setup.py test` install the depencies, use
buildout way of installing the eggs.

This software use `interpreter` recipe of `zc.recipe.egg` to install a
python with all eggs pre-installed. This is a way to get all the
dependencies at install time instead of getting them at run time from
pypi when running `python setup.py test`.
`erp5.util.testsuite` has been extended to support a parameter to
specify which python interpreter to use.

One issue is that this way of installing eggs by buildout cause chicken
and egg problem: cloning repository containing `slapos.recipe.cmmi`
needs git, and to compiling git needs `slapos.recipe.cmmi`.
The consequence of this is that re-running software will install too
many parts again.
One solution for this would be to clone `slapos.recipe.cmmi` with a
`git` command provided by testnode or system package.
Another solution would be to not install `slapos.recipe.cmmi` develop
egg, simply install the egg from it's current pypi version while
installing the software (running tests will be from the git checkout
anyway).
For now this is open issue.

Another point of attention is that `python setup.py test` install the
requirements listed in `test_requires`, but `zc.recipe.egg` does not
provide a way of installing these. Some of our packages have `[test]`
entrypoints, in this case, the software installs the test entrypoints.
For others, we install the eggs.

Other improvements:
 * use a simple `slapos.recipe:wrapper` instead of `slapos.cookbook:egg_test`
 * fix the typo in repository name erp5-util-repository ->
   erp5.util-repository ( this mean we will have to fix the test suites in
   nexedi ERP5 )
 * document "what is this software" and a scenario of how this software
   can be used to develop slapos eggs.
 * switch to buildout-hash.cfg for easier template hash management.

/reviewed-on nexedi/slapos!308

https://sourceware.org/glibc/wiki/Release/2.26#Removal_of_.27xlocale.h.27

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81712

monitor: move scripts wrapper and logrotate conf to buildout, uses some new promises from slapos.toolbox

monitor was updated in slapos.toolbox to not generate promise launcher scripts anymore. All
generated scripts are now in buildout.
Monitor promise run script is removed from cron, slapgrid is used to run promises.
Replace some old promises by the new ones from slapos.toolbox. Cleanup monitor configuration.
Monitor report and monitor-promises directory are now obsolete.

Update verion of lab.nexed.com/kirr/neo.git used and all of its dependencies.

NEO/go now uses 2 Cgo packages:

- github.com/gwenn/gosqlite, and
- github.com/DataDog/czlib

and github.com/soheilhy/cmux to multiplex NEO & HTTP traffic on the same port.

Otherwise it is straighforward update which transitively pulled some more
dependencies.

The most convenient way to discover CFLAGS/LDFLAGS when building Cgo bits is
via pkg-config:

    https://golang.org/cmd/cgo/

For this to work let's add pkg-config to be available there in gowork out of
the box, and provide users with a way to specify which C packages they want to
be there on gowork's $PKG_CONFIG_PATH, e.g. this way:

    [gowork]
    cpkgpath =
        ${sqlite3:location}/lib/pkgconfig
        ${zlib:location}/lib/pkgconfig

In buildout sources cpkgpath is specified as multiline - not one line with ":"
delimiters - with the idea that it should be easy to amend gowork.cpkgpath with "+="
in different places.

Upgrading passes python-2.7 compile and tests. Let's hope it will be ok
everywhere else.

Hello @alain.takoudjou  could you please try to build this branch. 

/reviewed-on nexedi/slapos!305

Rewriting commit history with `git rebase -i` always caused some
conflicts on md5sum of modified files. `update-hash` made all this
easier, because we could just revert buildout.hash.cfg, re-run
`update-hash` and commit the changes.

This tool makes this scenario a bit more user friendly by automating the
steps by running as a git mergetool.

An interactive rebase session can be initiated by running this command
from software/*/ directory:

`git rebase -i --exec "$(pwd)/../../update-hash $(pwd)/buildout.hash.cfg" origin/master`

and if conflict occur, run:

`git mergetool --tool update-hash-mergetool && EDITOR=cat git rebase --continue`

This way, rebase session can be almost non interactive (still have to
run the above mergetool command) when conflicts are only on md5sum
updates.

/reviewed-on !273