use security_groups_port_filtering from neutron-lib

The security_groups_port_filtering extension's API definition was
rehomed into neutron-lib with https://review.openstack.org/#/c/575243/
This patch consumes it by using the API def from neutron-lib and
removing it from neutron.

NeutronLibImpact

Change-Id: I78396846bc18a1adc550a950cf6006790ff863ed

neutron/extensions/security_groups_port_filtering.py

@@ -12,12 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from neutron_lib.api.definitions import security_groups_port_filtering
 from neutron_lib.api import extensions
 
-from neutron.extensions import security_groups_port_filtering_lib as apidef
-
 
 class Security_groups_port_filtering(extensions.APIExtensionDescriptor):
     """Extension class supporting filtering port depend on security group."""
 
-    api_definition = apidef
+    api_definition = security_groups_port_filtering

neutron/extensions/security_groups_port_filtering_lib.py

@@ -1,59 +0,0 @@
-#    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.
-
-# The alias of the extension.
-ALIAS = 'port-security-groups-filtering'
-
-# Whether or not this extension is simply signaling behavior to the user
-# or it actively modifies the attribute map.
-IS_SHIM_EXTENSION = True
-
-# Whether the extension is marking the adoption of standardattr model for
-# legacy resources, or introducing new standardattr attributes. False or
-# None if the standardattr model is adopted since the introduction of
-# resource extension.
-# If this is True, the alias for the extension should be prefixed with
-# 'standard-attr-'.
-IS_STANDARD_ATTR_EXTENSION = False
-
-# The name of the extension.
-NAME = 'Port filtering on security groups'
-
-# The description of the extension.
-DESCRIPTION = "Provides security groups filtering when listing ports"
-
-# A timestamp of when the extension was introduced.
-UPDATED_TIMESTAMP = "2018-01-09T09:00:00-00:00"
-
-# The resource attribute map for the extension.
-RESOURCE_ATTRIBUTE_MAP = {
-}
-
-# The subresource attribute map for the extension.
-SUB_RESOURCE_ATTRIBUTE_MAP = {
-}
-
-# The action map.
-ACTION_MAP = {
-}
-
-# The action status.
-ACTION_STATUS = {
-}
-
-# The list of required extensions.
-REQUIRED_EXTENSIONS = [
-]
-
-# The list of optional extensions.
-OPTIONAL_EXTENSIONS = [
-]