Support passive mysql servers

Adds code to support passive mysql instances.

manifests/db/mysql.pp

@@ -17,8 +17,6 @@
 #    nova_db_password     => 'changeme',
 #    allowed_hosts        => ['127.0.0.1', '10.0.0.%'],
 #  }
-
-
 class openstack::db::mysql (
     # Required MySQL
     # passwords
@@ -56,6 +54,7 @@ class openstack::db::mysql (
     class { 'mysql::server::account_security': }
   }
 
+  if ($enabled) {
     # Create the Keystone db
     class { 'keystone::db::mysql':
       user          => $keystone_db_user,
@@ -79,4 +78,5 @@ class openstack::db::mysql (
       dbname        => $nova_db_dbname,
       allowed_hosts => $allowed_hosts,
     }
+  }
 }