refactor: let transfer leader msg to be sent even when the dnode exiting

source/dnode/mgmt/mgmt_mnode/src/mmInt.c

@@ -148,9 +148,9 @@ static int32_t mmStart(SMnodeMgmt *pMgmt) {
 
 static void mmStop(SMnodeMgmt *pMgmt) {
   dDebug("mnode-mgmt start to stop");
+  mndPreClose(pMgmt->pMnode);
   taosThreadRwlockWrlock(&pMgmt->lock);
   pMgmt->stopped = 1;
-  mndPreClose(pMgmt->pMnode);
   taosThreadRwlockUnlock(&pMgmt->lock);
 
   mndStop(pMgmt->pMnode);

source/dnode/mgmt/node_mgmt/src/dmTransport.c

@@ -221,11 +221,11 @@ int32_t dmInitMsgHandle(SDnode *pDnode) {
 
 static inline int32_t dmSendReq(const SEpSet *pEpSet, SRpcMsg *pMsg) {
   SDnode *pDnode = dmInstance();
-  if (pDnode->status != DND_STAT_RUNNING) {
+  if (pDnode->status != DND_STAT_RUNNING && pMsg->msgType < TDMT_SYNC_MSG) {
     rpcFreeCont(pMsg->pCont);
     pMsg->pCont = NULL;
     terrno = TSDB_CODE_NODE_OFFLINE;
-    dError("failed to send rpc msg since %s, handle:%p", terrstr(), pMsg->info.handle);
+    dError("failed to send rpc msg:%s since %s, handle:%p", TMSG_INFO(pMsg->msgType), terrstr(), pMsg->info.handle);
     return -1;
   } else {
     rpcSendRequest(pDnode->trans.clientRpc, pEpSet, pMsg, NULL);