In particular LocMemCache doesn't have this option.

For more details, see:

http://stackoverflow.com/questions/23358787/memcache-get-returns-wrong-object-celery-django

Part of the file name template is eaten up by Python's `%` formatting,
resulting in log files missing the `s` of "stderr" and "stdout".

We were hanging on this:

```
Obtaining pika from
git+https://github.com/pika/pika.git@a731347fc0#egg=pika (from -r
/edx/app/xqueue/xqueue/requirements.txt (line 14))
  git clone in /edx/app/xqueue/venvs/xqueue/src/pika exists with URL
git://github.com/pika/pika.git
  The plan is to install the git repository
https://github.com/pika/pika.git
What to do?  (s)witch, (i)gnore, (w)ipe, (b)ackup
```

due to https://github.com/edx/edx-platform/blob/master/common/lib/xmodule/xmodule/open_ended_grading_classes/openendedchild.py#L79

I added  open-ended-message to XQUEUE_QUEUES

The instance gets tagged with the repo and hash that was deployed.

In order to support --check we need to ensure that registered
vars exist before checking their stdout. Otherwise ansible
errors out.

removing sync'd folder for /vagrant

change identity file default to none

removing check for git identity

typo

typo

adding python-yaml for dumping vars

certs settings changes for local disk generation

adding var dump var

adding template for certs

adding certs to default sites

adding 400 condition to the certs nginx template

updating update script for certs, removing discern

adding cert to help

giving www-data write permission to the web root

typo

adding download url

fixing web root

adding certs download url

adding more config for cert template dir, verify url

moving extra vars into the vagrantfile

adding verify url to vagrantfile

syntax

look for valid.html

adding ownertrust export

adding the trust import

removing skip-tags for reconfigure

upgrading to latest released ansible

adding carriage return to owner trust

setting cert urls in extra vars

moving extra vars to vagrantfile

adding new accept_hostkey parameter to all git calls

set key_file

changing dir for userknownhostsfile

adding more verbosity

changing knownhostsfile in environment

don't use userknownhostsfile

setting accept_hostkey back to yes

adding .ssh dirs for the 1.5 git module

adding certs nginx site

Make it easier to use a local pypi mirror in the roles listed above

COMMON_MYSQL_MIGRATE_PASS is not set

null

Always write the supervisor files and link them as necessary.

Drop the configs in the supervisor available directory. Instead of having a
seperate cfg dir for each service.

Seperate devstack logic from disabling supervisor tasks. Add the new flag so
devstack continues to not startup supervisor. Use new supervisor_available_dir
everywhere.

Remove mongo logic from abbey and remove stage_release. This should completely
remove our tie ins to mongo.

Also removing monitor repos script which depended on stage_release. We can add
in similar logic when we're ready to automate building the AMIs on rc branch
creation.

Updated requirements.