Document use of bandersnatch for pypi mirroring

We use bandersnatch to mirror pypi now and that should be documented.
Add all the usual header information with quick links to useful places
like local config and upstream bug trackers. Also, note how we run
bandersnatch and details on detecting and correcting stale packages on
pypi preventing local syncs.

Change-Id: I98db04c19c427335a4786a7923982fabcf57051b
Add running devstack-job to the python-mistralclient repository

A bunch of tests which check client methods are prepared to be run
on mistral devstack job. So, need to add running this job for
python-mistralclient repository.

Change-Id: I9aeddc8ed12bece46156f216f505f1fd96b63c4d
Add a gate_hook to gate-designate-devstack-dsvm

This allows Designate to correctly affect the gate environment variables
before a DevStack run.

Change-Id: I0c44229b2f67c9ea50e3f8786dccd8c50eb8e5e3
Added groups.openstack.org to StoryBoard

At Stefano's request.

Change-Id: I3d39c545318c1f846b9be9bb66082041423942db
Merge "Added groups.openstack.org to StoryBoard"
Merge "Add running devstack-job to the python-mistralclient repository"
Merge "Document use of bandersnatch for pypi mirroring"
Merge "Add a gate_hook to gate-designate-devstack-dsvm"