[sleep 3s after create dnode]

tests/script/unique/migrate/mn2_vn2_repl2_rmMnodeDir.sim

@@ -51,7 +51,7 @@ sleep 1000
 sql connect
 sleep 1000
 sql create dnode $hostname2
-sleep 1000
+sleep 3000
 
 print ============== step2: create database with replica 2, and create table, insert data
 $totalTableNum = 10
@@ -110,7 +110,7 @@ $loopCnt = $loopCnt + 1
 if $loopCnt == 10 then 
   return -1
 endi
-sleep 2000
+
 sql show dnodes
 if $rows != 3 then
   sleep 2000
@@ -236,7 +236,6 @@ $loopCnt = $loopCnt + 1
 if $loopCnt == 10 then 
   return -1
 endi
-sleep 2000
 sql show dnodes
 if $rows != 3 then
   sleep 2000