Added readWrite role to ceilometer@mongo user

manifests/profile/mongodb.pp

@@ -36,6 +36,7 @@ class iaas::profile::mongodb (
         mongodb::db { 'ceilometer':
           user   => $mongouser,
           password => $mongopasswd,
+          roles => ['dbAdmin','readWrite'],
         }
      } else {
         class {'::mongodb::server':