Revert "[routesync] Fix for stale dynamic neighbor (sonic-net#2553)"

This reverts commit cc768db.

fpmsyncd/routesync.cpp

@@ -733,32 +733,6 @@ void RouteSync::onRouteMsg(int nlmsg_type, struct nl_object *obj, char *vrf)
         {
             SWSS_LOG_DEBUG("Skip routes to eth0 or docker0: %s %s %s",
                     destipprefix, gw_list.c_str(), intf_list.c_str());
-            // If intf_list has only this interface, that means all of the next hops of this route 
-            // have been removed and the next hop on the eth0/docker0 has become the only next hop. 
-            // In this case since we do not want the route with next hop on eth0/docker0, we return. 
-            // But still we need to clear the route from the APPL_DB. Otherwise the APPL_DB and data 
-            // path will be left with stale route entry
-            if(alsv.size() == 1)
-            {
-                if (!warmRestartInProgress)
-                {
-                    SWSS_LOG_NOTICE("RouteTable del msg for route with only one nh on eth0/docker0: %s %s %s %s",
-                            destipprefix, gw_list.c_str(), intf_list.c_str(), mpls_list.c_str());
-
-                    m_routeTable.del(destipprefix);
-                }
-                else
-                {
-                    SWSS_LOG_NOTICE("Warm-Restart mode: Receiving delete msg for route with only nh on eth0/docker0: %s %s %s %s",
-                            destipprefix, gw_list.c_str(), intf_list.c_str(), mpls_list.c_str());
-
-                    vector<FieldValueTuple> fvVector;
-                    const KeyOpFieldsValuesTuple kfv = std::make_tuple(destipprefix,
-                                                                       DEL_COMMAND,
-                                                                       fvVector);
-                    m_warmStartHelper.insertRefreshMap(kfv);
-                }
-            }
             return;
         }
     }