Don't match commented [DEFAULT]

Class ceilometer::agent::compute fails when there are [DEFAULT] sections
commented. This patch is fixing this issue. For more info check
https://bugzilla.redhat.com/show_bug.cgi?id=1060712

Change-Id: I6d13f780f63af8798d94b49246576d1e144a4540
(cherry picked from commit a46bbc4)

manifests/agent/compute.pp

@@ -65,12 +65,12 @@
       line   =>
         'notification_driver=nova.openstack.common.notifier.rpc_notifier',
       path   => '/etc/nova/nova.conf',
-      after  => '\[DEFAULT\]',
+      after  => '^\s*\[DEFAULT\]',
       notify => Service['nova-compute'];
     'nova-notification-driver-ceilometer':
       line   => 'notification_driver=ceilometer.compute.nova_notifier',
       path   => '/etc/nova/nova.conf',
-      after  => '\[DEFAULT\]',
+      after  => '^\s*\[DEFAULT\]',
       notify => Service['nova-compute'];
   }