test: add valgrind case

tests/script/tsim/valgrind/basic.sim

@@ -26,8 +26,8 @@ sql show users
 sql alter user u1 sysinfo 1
 sql alter user u1 enable 1
 sql alter user u1 pass 'taosdata'
-sql alter user u2 sysinfo 0
 sql drop user u1
+sql_error alter user u2 sysinfo 0
 
 _OVER:
 system sh/exec.sh -n dnode1 -s stop -x SIGINT

tests/script/tsim/valgrind/basic2.sim

+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/exec.sh -n dnode1 -s start -v
+sql connect
+
+print =============== step1: create drop show dnodes
+$x = 0
+step1:
+	$x = $x + 1
+	sleep 1000
+	if $x == 10 then
+	  print ====> dnode not ready!
+		return -1
+	endi
+sql show dnodes
+print ===> $data00 $data01 $data02 $data03 $data04 $data05
+if $rows != 1 then
+  return -1
+endi
+
+print =============== step2: create db
+sql create database db vgroups 1
+
+_OVER:
+system sh/exec.sh -n dnode1 -s stop -x SIGINT