Apply hotfix to work around NVP3.0 RA filter

Fixes DHC-1152

akanda/quantum/plugins/nvp_quantum_plugin.py

@@ -16,6 +16,8 @@
 #    under the License.
 #
 
+import functools
+
 from quantum.common import topics
 from quantum.db import l3_db
 from quantum.db import l3_rpc_base as l3_rpc
@@ -33,6 +35,26 @@ LOG = logging.getLogger("QuantumPlugin")
 akanda.monkey_patch_ipv6_generator()
 
 
+def egress_multicast_hotfix(f):
+    @functools.wraps(f)
+    def wrapper(lport_obj, mac_address, fixed_ips, port_security_enabled,
+                security_profiles, queue_id):
+        f(lport_obj, mac_address, fixed_ips, port_security_enabled,
+          security_profiles, queue_id)
+
+        # evaulate the state so that we only override the value when enabled
+        # otherwise we are preserving the underlying behavior of the NVP plugin
+        if port_security_enabled:
+            # hotfix to enable egress mulitcast
+            lport_obj['allow_egress_multicast'] = True
+    return wrapper
+
+
+nvp.nvplib._configure_extensions = egress_multicast_hotfix(
+    nvp.nvplib._configure_extensions
+)
+
+
 class AkandaNvpRpcCallbacks(l3_rpc.L3RpcCallbackMixin, nvp.NVPRpcCallbacks):
     pass