Add more \\ to launchpad-bug Gerrit tracking-id

The number of backslashes necessary to escape a value in a Gerrit
config managed in a Puppet manifest is astounding. We need four, so
make sure we have enough in the launchpad-bug tracking-id match
string value.

Change-Id: Ie2e757e77286ab34547d3950a18e8b1bb4eb2c5f

modules/openstack_project/manifests/gerrit.pp

@@ -158,7 +158,7 @@ class openstack_project::gerrit (
       {
         name    => 'launchpad-bug',
         footers => ['closes-bug:', 'partial-bug:', 'related-bug:'],
-        match   => '\\#?(\\d+)',
+        match   => '\\\\#?(\\\\d+)',
         system  => 'Launchpad',
       },
       {