Use transaction in db_client pubsub notification, to avoid inconsistency

introduced by other concurrent cmd.

sonic_data_client/db_client.go

@@ -747,8 +747,8 @@ func tableData2Msi(tblPath *tablePath, useKey bool, op *string, msi *map[string]
 	for idx, dbkey := range dbkeys {
 		fv, err = redisDb.HGetAll(dbkey).Result()
 		if err != nil {
-			log.V(2).Infof("redis HGetAll failed for  %v, dbkey %s", tblPath, dbkey)
-			return err
+			log.V(2).Infof("redis HGetAll failed for  %v, dbkey %s, ignore it since atomic is not guaranteed", tblPath, dbkey)
+			continue
 		}
 
 		if tblPath.jsonTableKey != "" { // If jsonTableKey was prepared, use it