old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright (C) 2013 Midokura PTE LTD
  # All Rights Reserved.
  #
  #    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.
  #
  # @author: Rossella Sblendido, Midokura Japan KK
  # @author: Tomoe Sugihara, Midokura Japan KK
  # @author: Ryu Ishimoto, Midokura Japan KK
  
  from neutron.agent.linux import dhcp
  from neutron.openstack.common import log as logging
  from neutron.plugins.midonet.common import config  # noqa
  
  LOG = logging.getLogger(__name__)
  
  
  class DhcpNoOpDriver(dhcp.DhcpLocalProcess):
  
      @classmethod
      def existing_dhcp_networks(cls, conf, root_helper):
          """Return a list of existing networks ids that we have configs for."""
          return []
  
      @classmethod
      def check_version(cls):
          """Execute version checks on DHCP server."""
          return float(1.0)
  
      def disable(self, retain_port=False):
          """Disable DHCP for this network."""
          if not retain_port:
              self.device_manager.destroy(self.network, self.interface_name)
          self._remove_config_files()
  
      def release_lease(self, mac_address, removed_ips):
          pass
  
      def reload_allocations(self):
          """Force the DHCP server to reload the assignment database."""
          pass
  
      def spawn_process(self):
          pass
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright (C) 2013 Midokura PTE LTD
  # All Rights Reserved.
  #
  #    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.
  #
  # @author: Rossella Sblendido, Midokura Japan KK
  # @author: Tomoe Sugihara, Midokura Japan KK
  # @author: Ryu Ishimoto, Midokura Japan KK
  
  from neutron.agent.linux import dhcp
  from neutron.openstack.common import log as logging
  from neutron.plugins.midonet.common import config  # noqa
  
  LOG = logging.getLogger(__name__)
  
  
  class DhcpNoOpDriver(dhcp.DhcpLocalProcess):
  
      @classmethod
      def existing_dhcp_networks(cls, conf, root_helper):
          """Return a list of existing networks ids that we have configs for."""
          return []
  
      @classmethod
      def check_version(cls):
          """Execute version checks on DHCP server."""
          return float(1.0)
  
      def disable(self, retain_port=False):
          """Disable DHCP for this network."""
          if not retain_port:
              self.device_manager.destroy(self.network, self.interface_name)
          self._remove_config_files()
  
      def reload_allocations(self):
          """Force the DHCP server to reload the assignment database."""
          pass
  
      def spawn_process(self):
          pass
  
subject: Remove release_lease from the DHCP driver interface