XCOM-281: Configuration now includes JWT issuer and expiration date

Update the minos requirement var.

Changed what version means but forgot to update the minos_requirement var.

Feanil/update minos version

Switch to a single python process voter.

Minos updated with this PR: https://github.com/edx-ops/edx-minos/pull/15

Don't pkill some services.

Certain services will shutdown gracefully and so they may not be dead by the
time this task is run.  Those services should not be explicitly killed since
they may need to do things like finish a grading run or other instructor tasks.

Warn future devops about changing this

This isn't visible in Jenkins, so would only be changed here.

Stop celery workers using SIGINT instead of SIGTERM.

Don't use ELB pre/post logic with single instance installations.

According to the documentation TERM should do a graceful shutdown:
http://celery.readthedocs.org/en/latest/userguide/workers.html#process-signals

but this is not actually the case:
https://groups.google.com/forum/#!topic/celery-users/t8g5KvIvQZ8

SIGINT on the other hand seems to do what we want.

Upgrade github-oauth plugin to latest version.

Remove --tags=deploy when calling ansible-playbook for devstack

Corrected path to Commerce API

XCOM-312

Fix 'install python extra requirements' task.

Apply mirrored queue policy to all rabbitmq vhosts

if/else blocks that emit content that includes the `=` sign are no longer
supported in recent versions of ansible.

Trying to run the task under ansible 1.9 results in this error:

     variable inserted a new parameter into the module args.
     Be sure to quote variables if they contain equal signs (for example: "{{var}}").

Replace the {% if %} block with the new default(omit) filter/keyword.

For more info see:
https://groups.google.com/forum/#!msg/ansible-project/W9bG0tAI3aU/GFtrD9Ao9EwJ

Arbab/sandbox volume delete

Add CREDIT_PROVIDER_SECRET_KEYS configuration to edxapp role

Update list of forwarded ports

Add ports for edX Notes and for Bok Choy test servers.

Add edxapp_common as an admin_jenkins dependency

E0d/no discern

DEVOPS-2168 Set up this cookie name for overriding

Since the cookie's domain is *.edx.org use different names to help with
testing in stage/prod/edge.

Because admin_jenkins runs various management commands locally, it needs to be able to run the edxapp locally.  This means that it needs to be able to install the system requirements needed by the edxapp so that pip install to local venvs work correctly.