Match Gerrit changeid after all other commentlinks

* modules/openstack_project/manifests/gerrit.pp: The changeid
commentlink is greedy, so check it only after the other more
specific commentlinks.

Change-Id: I968d3cbaae94e46ee81c32a9f6f9fdac566d7d40
Merge "Match Gerrit changeid after all other commentlinks"