Remove vitrage::collector

The resource is deprecated and has no effect since
the service doesn't exist anymore.

Change-Id: If7c43d6a8b7dd9eff58651f0b130ef591696f593

manifests/vitrage.pp

@@ -102,7 +102,6 @@ class openstack_integration::vitrage {
   class { '::vitrage::notifier':
     notifiers => ['nova'],
   }
-  class { '::vitrage::collector': }
   class { '::vitrage::persistor': }
   class { '::vitrage::client': }