Add apt repo on Ubuntu

Ubuntu oneiric ships an older version of rabbitmq
that is not currently supported by our module (2.5)

This commit sets up the apt repos on Ubuntu to ensure that
the latest version is installed.

examples/site.pp

@@ -101,6 +101,9 @@ node glance {
 }
 
 node rabbitmq {
+  if($::operatingsystem == 'Ubuntu') {
+    class { 'rabbitmq::repo::apt': }
+  }
   class { 'nova::rabbitmq':
     userid       => $rabbit_user,
     password     => $rabbit_password,
@@ -141,6 +144,9 @@ node all {
   # This manifest installs all of the nova
   # components on one node.
   class { 'mysql::server': }
+  if($::operatingsystem == 'Ubuntu') {
+    class { 'rabbitmq::repo::apt': }
+  }
   class { 'nova::all':
     db_password => 'password',
     db_name => 'nova',