Align all web server usage on apache module.

Change-Id: Idd712a8ee5ec81c6b88b7d3e2270dce4da254927
Reviewed-on: https://review.openstack.org/10838
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins

manifests/init.pp

@@ -3,7 +3,7 @@ class gerritbot(
       $password,
       $server,
       $user,
-      $virtual_hostname
+      $vhost_name
       ) {
 
     file { "/usr/local/gerrit/gerritbot":

templates/gerritbot.config.erb

@@ -9,5 +9,5 @@ lockfile=/var/run/gerritbot/gerritbot.pid
 [gerrit]
 user=<%= user %>
 key=/home/gerrit2/.ssh/gerritbot_rsa
-host=<%= virtual_hostname %>
+host=<%= vhost_name %>
 port=29418