Upgrade manila's devstack-job to tempest-job

Now, manila project has job gate-manila-devstack-dsvm
that just deploys devstack with manila.
This patch enables tempest and its tests to cover
manila functionality.

Leave it still non-voting.

Partially implements bp: tempest-job

Change-Id: Ifefa9da00dd55eaae34df11bb25f8c5127dcb7a3
Merge "Upgrade manila's devstack-job to tempest-job"