Use Zuul's internal gearman server.

(This is only used by zuul-dev currently.)

Remove co-hosted gearmand server (will require manual cleanup).

Also, listen for feature/gearman events in openstack-infra.

Change-Id: I2dd58e62ff79277f1ef5c79da54bcc7511f2ccee
Reviewed-on: https://review.openstack.org/30175
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins

manifests/init.pp

@@ -21,6 +21,7 @@ class zuul (
   $vhost_name = $::fqdn,
   $serveradmin = "webmaster@${::fqdn}",
   $gearman_server = '127.0.0.1',
+  $internal_gearman = true,
   $jenkins_server = '',
   $jenkins_user = '',
   $jenkins_apikey = '',

templates/zuul.conf.erb

@@ -1,6 +1,10 @@
 [gearman]
 server=<%= gearman_server %>
 
+[gearman_server]
+start=<%= internal_gearman %>
+log_config=/etc/zuul/gearman-logging.conf
+
 [jenkins]
 server=<%= jenkins_server %>
 user=<%= jenkins_user %>