Remove left over code for availability_zone_filter

The extension in neutron-lib was released in 1.17.0 so it is time to
use the extension from neutron-lib.

Change-Id: Ia414c4c6870897ac6f3dfdc8e33c355eba7f34ff
Related-Bug: #1733362

neutron/db/agents_db.py

@@ -20,6 +20,7 @@ from eventlet import greenthread
 from neutron_lib.agent import constants as agent_consts
 from neutron_lib.api import converters
 from neutron_lib.api.definitions import agent as agent_apidef
+from neutron_lib.api.definitions import availability_zone_filter as azfil_ext
 from neutron_lib.api import extensions
 from neutron_lib.callbacks import events
 from neutron_lib.callbacks import registry
@@ -43,7 +44,6 @@ from neutron.agent.common import utils
 from neutron.api.rpc.callbacks import version_manager
 from neutron.conf.agent.database import agents_db
 from neutron.db.models import agent as agent_model
-from neutron.extensions import _availability_zone_filter_lib as azfil_ext
 from neutron.extensions import agent as ext_agent
 from neutron.extensions import availability_zone as az_ext
 from neutron.objects import agent as agent_obj

neutron/extensions/_availability_zone_filter_lib.py

@@ -1,34 +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.
-
-"""
-TODO(hongbin): This module should be deleted once neutron-lib containing
-https://review.opendev.org/#/c/577545/ change is released.
-"""
-
-from neutron_lib.api.definitions import availability_zone as az
-
-
-ALIAS = 'availability_zone_filter'
-IS_SHIM_EXTENSION = True
-IS_STANDARD_ATTR_EXTENSION = False
-NAME = 'Availability Zone Filter Extension'
-DESCRIPTION = 'Add filter parameters to AvailabilityZone resource'
-UPDATED_TIMESTAMP = '2018-06-22T10:00:00-00:00'
-RESOURCE_ATTRIBUTE_MAP = {}
-SUB_RESOURCE_ATTRIBUTE_MAP = {}
-ACTION_MAP = {}
-REQUIRED_EXTENSIONS = [
-    az.ALIAS
-]
-OPTIONAL_EXTENSIONS = []
-ACTION_STATUS = {}

neutron/extensions/availability_zone_filter.py

@@ -10,7 +10,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from neutron.extensions import _availability_zone_filter_lib as apidef
+from neutron_lib.api.definitions import availability_zone_filter as apidef
 from neutron_lib.api import extensions