Remove unregisterMessageHandler from NetMsgRegistrar thread (sonic-net#779)

Author: vaibhavhd

vslib/src/NetMsgRegistrar.cpp

@@ -134,9 +134,6 @@ void NetMsgRegistrar::run()
         }
     }
 
-    swss::NetDispatcher::getInstance().unregisterMessageHandler(RTM_NEWLINK);
-    swss::NetDispatcher::getInstance().unregisterMessageHandler(RTM_DELLINK);
-
     SWSS_LOG_NOTICE("netlink msg listener ended");
 }