test: valgrind case

tests/script/tsim/valgrind/checkError6.sim

+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/cfg.sh -n dnode1 -c debugflag -v 131
+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
+if $data(1)[4] != ready then
+  goto step1
+endi
+
+$tbPrefix = tb
+$tbNum = 5
+$rowNum = 10
+
+print =============== step2: prepare data
+sql create database db vgroups 2
+sql use db
+sql create table if not exists stb (ts timestamp, tbcol int, tbcol2 float, tbcol3 double) tags (tgcol int unsigned)
+
+$i = 0
+while $i < $tbNum
+  $tb = $tbPrefix . $i
+  sql create table $tb using stb tags( $i )
+  $x = 0
+  while $x < $rowNum
+    $cc = $x * 60000
+    $ms = 1601481600000 + $cc
+    sql insert into $tb values ($ms , $x , $x , $x ) 
+    $x = $x + 1
+  endw 
+  $i = $i + 1
+endw 
+
+print =============== step3: avg
+sql select avg(tbcol) from tb1
+sql select avg(tbcol) from tb1 where ts <= 1601481840000
+sql select avg(tbcol) as b from tb1
+sql select avg(tbcol) as b from tb1 interval(1d)
+goto _OVER
+sql select avg(tbcol) as b from tb1 where ts <= 1601481840000s interval(1m)
+sql select avg(tbcol) as c from stb
+sql select avg(tbcol) as c from stb where ts <= 1601481840000
+sql select avg(tbcol) as c from stb where tgcol < 5 and ts <= 1601481840000
+sql select avg(tbcol) as c from stb interval(1m)
+sql select avg(tbcol) as c from stb interval(1d)
+sql select avg(tbcol) as b from stb where ts <= 1601481840000s interval(1m)
+sql select avg(tbcol) as c from stb group by tgcol
+sql select avg(tbcol) as b from stb where ts <= 1601481840000s partition by tgcol interval(1m)
+
+_OVER:
+system sh/exec.sh -n dnode1 -s stop -x SIGINT
+print =============== check
+$null=
+
+system_content sh/checkValgrind.sh -n dnode1 
+print cmd return result ----> [ $system_content ]
+if $system_content > 0 then
+  return -1
+endi 
+
+if $system_content == $null then
+  return -1
+endi