text: #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  # This is a placeholder for Wallaby backports.
  # Do not use this number for new Xena work. New work starts after all the
  # placeholders.
  #
  # See this for more information:
  # http://lists.openstack.org/pipermail/openstack-dev/2013-March/006827.html
  
  
  def upgrade(migrate_engine):
      pass
  