rehome neutron.objects.extensions.standardattributes

This patch rehomes neutron.objects.extensions.standardattributes into
neutron_lib.objects.extensions.standardattributes
A release note is also included.

Also see: https://bugs.launchpad.net/neutron/+bug/1815827

Change-Id: I49b7fcdb3f95f4d9304a6531a701abecc5aafe2f

neutron_lib/objects/extensions/standardattributes.py

@@ -0,0 +1,50 @@
+#    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.
+
+from oslo_versionedobjects import fields as obj_fields
+
+
+STANDARD_ATTRIBUTES = {
+    'revision_number': obj_fields.IntegerField(),
+    'description': obj_fields.StringField(nullable=True),
+    'created_at': obj_fields.DateTimeField(nullable=True, tzinfo_aware=False),
+    'updated_at': obj_fields.DateTimeField(nullable=True, tzinfo_aware=False),
+}
+
+
+def add_standard_attributes(cls):
+    """Add standard attributes to the said class.
+
+    :param cls: The class to add standard attributes to.
+    :returns: None.
+    """
+    # Don't use parent's fields in case child class doesn't create
+    # its own instance of list
+    cls.fields = cls.fields.copy()
+    cls.fields.update(STANDARD_ATTRIBUTES)
+    # those fields are updated by sqlalchemy itself
+    cls.fields_no_update += ('created_at', 'updated_at')
+    # revision numbers are managed by service plugin and are bumped
+    # automatically; consumers should not bump them explicitly
+    cls.fields_no_update.append('revision_number')
+
+
+def add_tag_filter_names(cls):
+    """Add tag filter names to the said class.
+
+    :param cls: The class to add tag filter names to.
+    :returns: None.
+    """
+    cls.add_extra_filter_name("tags")
+    cls.add_extra_filter_name("not-tags")
+    cls.add_extra_filter_name("tags-any")
+    cls.add_extra_filter_name("not-tags-any")

releasenotes/notes/rehome-obj-stdattrs-06c4df5bb1fca3f1.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - The ``neutron.objects.extensions.standardattributes`` module is now
+    available as ``neutron_lib.objects.extensions.standardattributes``.