Merge pull request #2093 from taosdata/hotfix/sangshuduo/fix-test-script-as-jeff-suggestions

Hotfix/sangshuduo/fix test script as jeff suggestions

tests/script/sh/exec.sh

@@ -95,7 +95,7 @@ else
   if [ -n "$PID" ]; then 
     if [ "$SIGNAL" = "SIGINT" ]; then 
       echo killed by signal
-      kill -sigint $PID
+      kill -SIGINT $PID
     else
       kill -9 $PID
     fi