add wal back to vnode

source/server/vnode/inc/vnodeInt.h

@@ -83,7 +83,7 @@ typedef struct {
 #if 0  
   SSyncCfg syncCfg;
 #endif  
-  //SWalCfg  walCfg;
+  SWalCfg  walCfg;
   void *   qMgmt;
   char *   rootDir;
   tsem_t   sem;

source/server/vnode/inc/vnodeWrite.h

@@ -27,7 +27,7 @@ taos_queue vnodeAllocWriteQueue(SVnode *pVnode);
 void       vnodeFreeWriteQueue(taos_queue pQueue);
 
 void    vnodeProcessWriteMsg(SRpcMsg *pRpcMsg);
-//int32_t vnodeProcessWalMsg(SVnode *pVnode, SWalHead *pHead);
+int32_t vnodeProcessWalMsg(SVnode *pVnode, SWalHead *pHead);
 
 void vnodeStartWrite(SVnode *pVnode);
 void vnodeStopWrite(SVnode *pVnode);