test: adjust unstable case

tests/parallel_test/cases.task

@@ -294,7 +294,7 @@
 ,,,script,./test.sh -f tsim/vnode/replica3_basic.sim
 ,,y,script,./test.sh -f tsim/vnode/replica3_repeat.sim
 ,,y,script,./test.sh -f tsim/vnode/replica3_vgroup.sim
-#,,y,script,./test.sh -f tsim/vnode/replica3_many.sim
+,,y,script,./test.sh -f tsim/vnode/replica3_many.sim
 ,,y,script,./test.sh -f tsim/vnode/replica3_import.sim
 ,,y,script,./test.sh -f tsim/vnode/stable_balance_replica1.sim
 ,,y,script,./test.sh -f tsim/vnode/stable_dnode2_stop.sim

tests/script/tsim/vnode/replica3_many.sim

@@ -201,31 +201,39 @@ system sh/exec.sh -n dnode2 -s start
 sleep 3000
 
 print ======== step6
+$x = 0
+step6: 
+	$x = $x + 1
+	sleep 1000
+	if $x == 50 then
+		return -1
+	endi
+
 sql select count(*) from db1.tb1
 print select count(*) from db1.tb1 ==> $data00 $lastRows1 
 if $data00 <= $lastRows1 then
-  return -1
+  goto step6
 endi
 $lastRows1 = $data00
 
 sql select count(*) from db2.tb2
 print select count(*) from db2.tb2 ==> $data00 $lastRows2 
 if $data00 <= $lastRows2 then
-  return -1
+  goto step6
 endi
 $lastRows2 = $data00
 
 sql select count(*) from db3.tb3
 print select count(*) from  db3.tb3 ==> $data00 $lastRows3 
 if $data00 <= $lastRows3 then
-  return -1
+  goto step6
 endi
 $lastRows3 = $data00
 
 sql select count(*) from db4.tb4
 print select count(*) from  db4.tb4 ==> $data00 $lastRows4 
 if $data00 <= $lastRows4 then
-  return -1
+  goto step6
 endi
 $lastRows4 = $data00