Check for whitespace around changeid searches

If a URL contains a change ID such as
http://example.org/change/123abc456/log.html then the changeid regex
matches the id and tries to turn it into a link like:
http://example.org/change/<a href="#q,123abc456,n,z">123abc456</a>/log.html
which clearly breaks the original URL.

To fix we should check for whitespace or periods around the changeid
in the comment. Also, check for <p> tags that gerrit adds to comments
for us.

Change-Id: Ia337ddfe2ddc82c858072135a613786070f0dc67

modules/openstack_project/manifests/gerrit.pp

@@ -128,8 +128,8 @@ class openstack_project::gerrit (
     commentlinks                    => [
       {
         name  => 'changeid',
-        match => '(I?[0-9a-f]{8,40})',
-        link  => '#q,$1,n,z',
+        match => '(<p>|[\\s]+)(I?[0-9a-f]{7,40})(</p>|[\\s.]+)',
+        html  => '$1<a href=\"#q,$2,n,z\">$2</a>$3',
       },
       {
         name  => 'bugheader',