Revert "Add "network" to the EXT_PARENT_RESOURCE_MAPPING"

This reverts commit a014720912.

Reason for revert: It is not needed to have network in the EXT_PARENT_RESOURCE_MAPPING as we will keep NET_OWNER rules and use
them for subnets and ports API.
Please see [1] for more detailed explanation why it's better to keep NET_OWNER rules for those policies.

[1] https://review.opendev.org/c/openstack/neutron/+/889153

Change-Id: Ia2cd6301e04ac502888ee2b8042ea8c19873a95a

neutron_lib/services/constants.py

@@ -14,7 +14,6 @@
 
 from neutron_lib.api.definitions import l3
 from neutron_lib.api.definitions import local_ip
-from neutron_lib.api.definitions import network
 from neutron_lib.api.definitions import qos
 from neutron_lib.plugins import constants as plugin_const
 
@@ -32,5 +31,4 @@ EXT_PARENT_RESOURCE_MAPPING = {
     l3.ROUTER: plugin_const.CONNTRACKHELPER,
     local_ip.RESOURCE_NAME: plugin_const.LOCAL_IP,
     qos.POLICY: plugin_const.QOS,
-    network.RESOURCE_NAME: plugin_const.CORE,
 }

releasenotes/notes/network-in-parent-resource-mapping-0bc57f9bb54d1dc9.yaml

@@ -1,5 +0,0 @@
----
-other:
-  - |
-    Resource ``network`` was added to the ``EXT_PARENT_RESOURCE_MAPPING in
-    ``neutron_lib.services.constants``.