simplify list_routers_on_l3_agent

Change-Id: I3574b977604faedc33699a4154d20e18ad11b963

akanda/neutron/plugins/ovs_neutron_plugin.py

@@ -16,7 +16,6 @@
 #    under the License.
 #
 
-from neutron.db import l3_agentschedulers_db
 from neutron.plugins.openvswitch import ovs_neutron_plugin
 
 from akanda.neutron.plugins import decorators as akanda
@@ -49,16 +48,9 @@ class OVSNeutronPluginV2(ovs_neutron_plugin.OVSNeutronPluginV2):
             context, id, subnet)
 
     def list_routers_on_l3_agent(self, context, agent_id):
-        # Override L3AgentSchedulerDbMixin method
-        query = context.session.query(
-            l3_agentschedulers_db.RouterL3AgentBinding.router_id
-        )
-        router_ids = [item[0] for item in query]
-        if router_ids:
-            return {'routers':
-                    self.get_routers(context, filters={'id': router_ids})}
-        else:
-            return {'routers': []}
+        return {
+            'routers': self.get_routers(context),
+        }
 
     def list_active_sync_routers_on_active_l3_agent(
             self, context, host, router_ids):