[OVN] Handle creation of Port_Binding with chassis set (2)

This is the follow-up of [1], missing in the OVN agent "metadata"
extension implementation.

When there is a backlog of notifications to be sent, it is possible
that ovsdb-server will merge insert and update notifications. Due
to this, we need to handle the situation where we see a Port_Binding
created with the chassis set.

[1]https://review.opendev.org/c/openstack/neutron/+/903796

Related-Bug: #2017748
Signed-off-by: Rodolfo Alonso Hernandez <ralonsoh@redhat.com>
Change-Id: I333fc0d4e61bc9aace007ca5de413d9cdc12c4a5

neutron/agent/ovn/extensions/metadata.py

@@ -139,6 +139,7 @@ class MetadataExtension(extension_manager.OVNAgentExtension,
     def sb_idl_events(self):
         return [metadata_agent.PortBindingUpdatedEvent,
                 metadata_agent.PortBindingDeletedEvent,
+                metadata_agent.PortBindingCreateWithChassis,
                 ChassisPrivateCreateEvent,
                 ]
 
@@ -197,7 +198,7 @@ class MetadataExtension(extension_manager.OVNAgentExtension,
         self._proxy.run()
 
         # Do the initial sync.
-        self.sync()
+        self.sync(provision=False)
 
         # Register the agent with its corresponding Chassis
         self._update_chassis_private_config()