Always enqueue route DB table operations on fabric route table.

As fabric tables will never be deleted, table deletion before the
enqueued entry is processes cannot happen.

Change-Id: I2348d8aaeb8e4caa277b69864f0a4516739e2f47
closes-bug: 1542681

src/vnsw/agent/oper/agent_route.cc

@@ -680,7 +680,8 @@ void AgentRoute::EnqueueRouteResync(void) const {
     DBRequest  req(DBRequest::DB_ENTRY_ADD_CHANGE);
     req.key = GetDBRequestKey();
     (static_cast<AgentKey *>(req.key.get()))->sub_op_ = AgentKey::RESYNC;
-    get_table()->Enqueue(&req);
+    Agent *agent = (static_cast<AgentRouteTable *>(get_table()))->agent();
+    agent->fabric_inet4_unicast_table()->Enqueue(&req);
 }
 
 //If a direct route get modified invariably trigger change

src/vnsw/agent/oper/bridge_route.cc

@@ -104,7 +104,7 @@ void BridgeAgentRouteTable::AddBridgeReceiveRouteReq(const Peer *peer,
     DBRequest req(DBRequest::DB_ENTRY_ADD_CHANGE);
     req.key.reset(new BridgeRouteKey(peer, vrf_name, mac, vxlan_id));
     req.data.reset(new L2ReceiveRoute(vn_name, vxlan_id, 0));
-    Enqueue(&req);
+    agent()->fabric_l2_unicast_table()->Enqueue(&req);
 }
 
 void BridgeAgentRouteTable::AddBridgeReceiveRoute(const Peer *peer,

src/vnsw/agent/oper/evpn_route.cc

@@ -113,7 +113,7 @@ void EvpnAgentRouteTable::AddReceiveRouteReq(const Peer *peer,
     req.key.reset(new EvpnRouteKey(peer, vrf_name, mac, ip_addr,
                                    ethernet_tag));
     req.data.reset(new L2ReceiveRoute(vn_name, ethernet_tag, label));
-    Enqueue(&req);
+    agent()->fabric_evpn_table()->Enqueue(&req);
 }
 
 void EvpnAgentRouteTable::AddReceiveRoute(const Peer *peer,