Merge pull request #2092 from taosdata/hotfix/sangshuduo/fix-test-script-as-jeff-suggestions

change to bash to support [[ ]] syntax.

tests/script/sh/clear.sh

-#!/bin/sh
+#!/bin/bash
 
 echo "Executing clear.sh"
 

tests/script/sh/exec_tarbitrator.sh

-#!/bin/sh
+#!/bin/bash
 
 # if [ $# != 2 || $# != 3 ]; then 
   # echo "argument list need input : "

tests/script/sh/exec_up.sh

-#!/bin/sh
+#!/bin/bash
 
 # if [ $# != 4 || $# != 5 ]; then 
   # echo "argument list need input : "