[OVN] Add subnetpool-prefix-ops extension to ML2/OVN mech driver

Related-Bug: #1792901
Change-Id: I6b2e86cd252c345b25583651152009baa3320f19
(cherry picked from commit 1600d54)

Author: ralonsoh

neutron/common/ovn/extensions.py

@@ -73,6 +73,7 @@
 from neutron_lib.api.definitions import stateful_security_group
 from neutron_lib.api.definitions import subnet_dns_publish_fixed_ip
 from neutron_lib.api.definitions import subnet_service_types
+from neutron_lib.api.definitions import subnetpool_prefix_ops
 from neutron_lib.api.definitions import trunk
 from neutron_lib.api.definitions import uplink_status_propagation
 from neutron_lib.api.definitions import vlantransparent
@@ -156,6 +157,7 @@
     constants.SUBNET_ALLOCATION_EXT_ALIAS,
     'standard-attr-tag',
     'standard-attr-timestamp',
+    subnetpool_prefix_ops.ALIAS,
     subnet_service_types.ALIAS,
     trunk.ALIAS,
     seg_def.ALIAS,

releasenotes/notes/ovn-add-extension-subnetpool-prefix-ops-9b2e4dbdcc174ede.yaml

@@ -0,0 +1,3 @@
+other:
+  - |
+    Added extension ``subnetpool-prefix-ops`` to the ML2/OVN mechanism driver.