Add Patrole gate job for stable/rocky

Now we have stable/rocky branch ready for devstack
and so does for all service projects.

This commit adds the Patrole testing for stable/rocky
by adding new jobs running on stable/rocky version of
openstack.

Depends-On: https://review.openstack.org/#/c/596276/
Change-Id: I522a5bd706723443713bd91270045a37187eff1a
1 file changed