Add "update_network" implementation to "L3AgentExtension" child classes

Added "update_network" method implementation to all "L3AgentExtension"
child classes. This new method will be added as a new abstract method
in future neutron-lib releases.

Needed-By: https://review.opendev.org/c/openstack/neutron-lib/+/818536
Related-Bug: #1950454
Change-Id: Ib50d37d57c3d6a69a68876ae04f468325516d4eb

neutron/agent/l3/extensions/conntrack_helper.py

@@ -278,3 +278,6 @@ class ConntrackHelperAgentExtension(l3_extension.L3AgentExtension):
 
     def ha_state_change(self, context, data):
         pass
+
+    def update_network(self, context, data):
+        pass

neutron/agent/l3/extensions/port_forwarding.py

@@ -470,3 +470,6 @@ class PortForwardingAgentExtension(l3_extension.L3AgentExtension):
 
     def ha_state_change(self, context, data):
         pass
+
+    def update_network(self, context, data):
+        pass

neutron/agent/l3/extensions/qos/fip.py

@@ -346,3 +346,6 @@ class FipQosAgentExtension(qos_base.L3QosAgentExtensionBase,
 
     def ha_state_change(self, context, data):
         pass
+
+    def update_network(self, context, data):
+        pass

neutron/agent/l3/extensions/qos/gateway_ip.py

@@ -99,6 +99,9 @@ class RouterGatewayIPQosAgentExtension(qos_base.L3QosAgentExtensionBase,
     def ha_state_change(self, context, data):
         pass
 
+    def update_network(self, context, data):
+        pass
+
     def process_gateway_rate_limit(self, context, router_info):
         is_distributed_router = router_info.router.get('distributed')
         agent_mode = router_info.agent_conf.agent_mode

neutron/services/logapi/agent/l3/base.py

@@ -106,3 +106,6 @@ class L3LoggingExtensionBase(object):
 
     def ha_state_change(self, context, data):
         pass
+
+    def update_network(self, context, data):
+        pass