Merge branch 'haproxy-config-header' of https://lab.nexedi.com/nexedi/slapos into haproxy-config-header

- destination server gets its own server id
- this removes complexity at the cost of respecting consistency in names
- http-send-name-header is not well supported by haproxy and that it may leads to random errors with not well formated request

- destination server gets its own server id
- this removes complexity at the cost of respecting consistency in names

Proftpd with sftp and virtual users

http://www.proftpd.org/docs/

# Features

 * sftp only is enabled
 * partially uploadloaded are not visible thanks to [`HiddenStores`](http://proftpd.org/docs/directives/linked/config_ref_HiddenStores.html) ( in fact they are, but name starts with `.` )
 * 5 failed login attempts will cause the host to be temporary banned


# TODO

 * only password login is enabled. enabling [`SFTPAuthorizedUserKeys`](http://www.proftpd.org/docs/contrib/mod_sftp.html#SFTPAuthorizedUserKeys) seems to break password only login
 * log rotation
 * make sure SFTPLog is useful (seems very verbose and does not contain more than stdout)
 * make it easier to manage users ( using `mod_auth_web` against an ERP5 endpoint or accepting a list of user/password as instance parameter )
 * allow configuring webhooks when new file is uploaded



----

depends on nexedi/slapos.core!41

/reviewed-on nexedi/slapos!311

_ (underscore) is not supported by apache as domain name
(https://bugzilla.redhat.com/show_bug.cgi?id=1410130), so avoid using it.

/reviewed-on nexedi/slapos!320

The build of nodejs uses python, and python leaking from the system can lead
to unexpected results, thus use provided from SlapOS.

/reviewed-on nexedi/slapos!319

The correct is use require and not required.

fix getInstanceParameterDict typo

/reviewed-by: TrustMe

To run tests from software/proftpd/test

To run tests locally by `python setup.py test`

This is a new kind of test suite that compile software, request instance
with specific parameters and check that the instance works as expected.

@alain, @rafael 

Test is here: https://nexedi.erp5.net/test_result_module/20180412-3688F368/2/view

Its failures which are different from  master one (https://nexedi.erp5.net/test_result_module/20180412-3501D1A/1) seems unrelated to my changes thus I propose to emrge it in and include in next webrunner release.

/reviewed-on nexedi/slapos!317

This reverts commit 1bdac5da.

This commit breaks webrunner resilience importer. This is not the proper fix

Because of this: https://lab.nexedi.com/nexedi/slapos.core/blob/master/slapos/grid/promise/generic.py#L44

When slapgrid run promises, it now save promise logs. Thus we need to logrotate them.
Thanks @Alain.

This recipe will be used to generate promise in etc/plugin dir. It solve the problem of promise eggs
dependencies and allow to set custom parameter to use in promise.

The generated script will looks like:

    import sys
    sys.path[0:0] = [
      ...
    ]

    extra_config_dict = {
      'KEY': 'VALUE'
    }

    CONTENT

CONTENT is a python code, the expected content looks like:

    from namespace.module import RunPromise

then the promise section in buildout will be something like:

    [my-promise]
    recipe = slapos.cookbook:promise.plugin
    eggs =
      NAME
      ...
    output = OUTPUT
    content =
      from namespace.module import RunPromise

    config-KEY = VALUE