Fix changeid links in gerrit

Previously the wrong regex substitution was used in changeid links.
The replacement $1 refers to the first parentheses-enclosed match
where the regex itself didn't have any parentheses. Instead use
the entire match as a substitute in the link.

Change-Id: I7c21bfbb575440396c75cb56a03a0573150ba411

modules/openstack_project/manifests/gerrit.pp

@@ -161,7 +161,7 @@ class openstack_project::gerrit (
       {
         name  => 'changeid',
         match => 'I[0-9a-f]{8,40}',
-        link  => '#q,$1,n,z',
+        link  => '#q,$0,n,z',
       },
       {
         name  => 'gitsha',