modify taosdemo query test case

tests/pytest/tools/taosdemoAllTest/querySuperMutisql100.json

@@ -11,7 +11,7 @@
     "super_table_query": {
         "stblname": "stb0",
         "query_interval": 10000,
-        "concurrent": 9,
+        "threads": 9,
         "sqls": [
           {    
               "sql": "select last_row(*) from xxxx",

tests/pytest/tools/taosdemoAllTest/taosdemoTestQueryWithJson.py

@@ -174,15 +174,15 @@ class TDTestCase:
             "2020-11-01 00:00:00.004")
 
         # query times less than or equal to 100
-        os.system(
+        assert os.system(
             "%staosBenchmark -f tools/taosdemoAllTest/queryInsertdata.json" %
-            binPath)
-        os.system(
+            binPath) == 0
+        assert os.system(
             "%staosBenchmark -f tools/taosdemoAllTest/querySpeciMutisql100.json" %
-            binPath)
-        os.system(
+            binPath) != 0
+        assert os.system(
             "%staosBenchmark -f tools/taosdemoAllTest/querySuperMutisql100.json" %
-            binPath)
+            binPath) == 0
 
         # query result print QPS
         os.system(