Because the CMS uses the git hash of the edx-platform for the
static path it can be problematic if you update the edx-platform
repo for the worker AFTER you update the edx-platform repo
for edxapp.  When running the edxapp role in worker mode
rake gather_assets is skipped.

This is a workaround but we may want to consider using separate
repos for worker and edxapp for situations where both are installed
on the same server.

Some playbooks are missing the new forum nginx reverse proxy configuration
file, which prevents the LMS to access the forum service.

Also renaming the deploy_* plays to the play name

services if it changes
deploy tasks no longer stop the service and will notify the restart
if any task changes

of rbenv and virtualenv roles

* vagrant-shortstack
  - lms / studio / forums
* vagrant-shortstack-xml
  - lms / studio / forums (xml primary)
* vagrant-fullstack
  - everything that we think is working

Swap lms and lms-xml nginx ports and remove edxapp_sandbox.yml from vars_files because it no longer exists.