This changeset adds a config option (TEST_MASTER)
to toggle testing with the current Ceph master.
The builds are retrieved from Shaman, which is the
platform used by the Ceph community to submit their
latest builds.
The main goal of this change is to use this on our CI
and be able to catch bugs in OpenStack services that use
Ceph as a backend more quickly. Because of this, the
required non-voting job is also added.
Change-Id: Ibe26f89e7be3061cdb7acb441727efb2c396e29e