Move pin of puppet-ceph to stable/luminous for queens
Move pin of puppet-ceph to stable/luminous for queens

queens is deployed with luminous in queens, let's
consume puppet-ceph from branch stable/luminous for
queens. [1] is required for queens jobs which exists
since stable/luminous.

[1] https://github.com/openstack/puppet-ceph/commit/c61c01840fbe2ffaeb88fd512eb13b608b840873

Change-Id: I9d6e9873e7a66adc128b75f23e05608c5b8841a8

redhat-openstack/rdoinfo,javierpena/rdoinfo