Have Zuul replicate to git.o.o

Change-Id: I750e8ea75181dacb10275a38fa702ed1edb56d4c

manifests/init.pp

@@ -32,7 +32,8 @@ class zuul (
   $push_change_refs = false,
   $job_name_in_report = false,
   $revision = 'master',
-  $statsd_host = ''
+  $statsd_host = '',
+  $replication_targets = []
 ) {
   include apache
   include pip

templates/zuul.conf.erb

@@ -20,3 +20,9 @@ url_pattern=<%= url_pattern %>
 status_url=<%= status_url %>
 job_name_in_report=<%= job_name_in_report %>
 zuul_url=<%= zuul_url %>
+
+<% if replication_targets != [] -%>
+[replication]
+<% replication_targets.each do |target| -%>
+<%= target['name'] %>=<%= target['url'] %>
+<% end -%>