Add nova-ceph-multistore job in devstack gate

nova-ceph-multistore is defined in nova side to test the
glance multistore on ceph and it is voting on nova gate.

There are other multistore testing enhancement going on for
example- https://review.opendev.org/#/c/743800/. so to avoid
any regression, let's run exiting mutistore job on devstack
gate too.

Change-Id: Ie82b4057463df4b6138c53b14a582bd84866aebd
1 file changed