Feanil/fix notifier celery process leak

Ansible2 compatibility and jenkins plugin updates

This was leaving \ in the generated files, which broke Jenkins

We set LANG in lms.conf and cms.conf but missed it for Celery

- Added file to allow bower to install as root
- Added xvfb, firefox, and gettext packages for testing and local development

update c++ lib for android on xenial

Having the intermediate shell script causes the signals to not
propagate correctly.  So when supervisor stops the workers the
celery root process dies but the actual workers hang around. On
sandboxes this results in there eventually being lots of stray
workers that eventually chew through all the memory on the box.

added celery queue variable

Handle the edxapp worker case with two ASGs but no ELBs

There's actually 3 layers of quoting here so using some single quotes.

The end result in the file was previously
`export GO_SERVER_SYSTEM_PROPERTIES="-Dgo.config.repo.gc.cron="0 0 2 ? * SAT" go.config.repo.gc.periodic="Y""`

Note how the open quote after the equal gets closed by the quote after `cron=`.  This is not what we want.
The new output looks like this:
`export GO_SERVER_SYSTEM_PROPERTIES='-Dgo.config.repo.gc.cron="0 0 2 ? * SAT" -Dgo.config.repo.gc.periodic="Y"'`

Single quoting all the double quotes on that line.

Make sure we have pip and pip3 at the right version pointing to the r…

TNL-6510: Initialize elasticsearch for forums.

Previously it would exit without a message but no inventory.

Update Vagrantfiles for ficus.1rc3

Don't enrol the staff user in the demo course if the staff user wasn't created.

Feanil/gocd upgrade

The underlying role no longer exists.

Ingore retry files.

They used to get put into your home directory.  Now they go in the
directory you ran ansible from.

Upgrade the pip3 version (which also keeps it installed when upgrading the pip version)

(cherry picked from commit 3b3b4893)

We originally made these changes when trying to debug the connection
between the go-agent and go-server.  Having them here makes it harder to
upgrade go-agent versions since they are regularly making improvements
to the upstream dockerfiles.

Install MySQL 5.6 from an edX repo

Silently fail on missing requirements

Fix the team mention in the PR template

ECOM-6975