[TD-4369]<test>: add testcase of resubscibe and json file

tests/pytest/tools/taosdemoAllTest/subSyncResFileNull.json

+{
+    "filetype":"subscribe",
+    "cfgdir": "/etc/taos",
+    "host": "127.0.0.1",
+    "port": 6030,
+    "user": "root",
+    "password": "taosdata",
+    "databases": "db",
+    "confirm_parameter_prompt": "no",
+    "specified_table_query":
+      {
+       "concurrent":2, 
+       "mode":"sync", 
+       "interval":0, 
+       "restart":"no", 
+       "keepProgress":"no",
+       "resubAfterConsume":-1,
+       "endAfterConsume":1,
+       "sqls": [
+        {
+          "sql": "select * from stb00_0", 
+          "result": ""
+        },
+        {
+          "sql": "select ts from stb00_1", 
+          "result": ""
+        }]
+      },
+    "super_table_query": 
+      {
+       "stblname": "stb0",
+       "threads":2, 
+       "mode":"sync", 
+       "interval":10000, 
+       "restart":"no", 
+       "keepProgress":"no",
+       "resubAfterConsume":-1,
+       "endAfterConsume":1,
+       "sqls": [
+        {
+          "sql": "select * from xxxx where ts >= '2021-02-25 10:00:01.000' ", 
+          "result": ""
+        },
+        {
+          "sql": "select * from xxxx where ts > '2021-02-25 10:00:04.000' ", 
+          "result": ""
+        }]
+      }
+  }
\ No newline at end of file

tests/pytest/tools/taosdemoAllTest/taosdemoTestSubWithJson.py

@@ -116,9 +116,17 @@ class TDTestCase:
         assert os.system("%staosdemo -f tools/taosdemoAllTest/subSyncSpecMaxsql100.json" % binPath) != 0
         assert os.system("%staosdemo -f tools/taosdemoAllTest/subSyncSuperMaxsql100.json" % binPath) != 0
 
+        # # result files is null
+        # os.system("%staosdemo -f tools/taosdemoAllTest/subInsertdataMaxsql100.json" % binPath)
+        # os.system("%staosdemo -f tools/taosdemoAllTest/subSyncResFileNull.json" % binPath)
+        # # assert os.system("%staosdemo -f tools/taosdemoAllTest/subSyncResFileNull.json" % binPath) != 0
+
+
+
+
         # resubAfterConsume= -1 endAfter=-1 ;
         os.system('kill -9 `ps aux|grep "subSyncResubACMinus1.json" |grep -v "grep"|awk \'{print $2}\'` ')
-        os.system("nohup %staosdemo -f tools/taosdemoAllTest/subResubjson/subSyncResubACMinus1.json & " % binPath)
+        os.system("nohup %staosdemo -f tools/taosdemoAllTest/Resubjson/subSyncResubACMinus1.json & " % binPath)
         sleep(2)
         query_pid1 = int(subprocess.getstatusoutput('ps aux|grep "subSyncResubACMinus1.json" |grep -v "grep"|awk \'{print $2}\'')[1])
         print("get sub1 process'pid")
@@ -138,7 +146,7 @@ class TDTestCase:
         # # resubAfterConsume= -1 endAfter=0 ;
         # os.system("%staosdemo -f tools/taosdemoAllTest/subInsertdataMaxsql100.json" % binPath)
         # os.system('kill -9 `ps aux|grep "subSyncResubACMinus1endAfter0.json" |grep -v "grep"|awk \'{print $2}\'` ')
-        # os.system("nohup %staosdemo -f tools/taosdemoAllTest/subResubjson/subSyncResubACMinus1endAfter0.json & " % binPath)
+        # os.system("nohup %staosdemo -f tools/taosdemoAllTest/Resubjson/subSyncResubACMinus1endAfter0.json & " % binPath)
         # sleep(2)
         # query_pid1 = int(subprocess.getstatusoutput('ps aux|grep "subSyncResubACMinus1endAfter0.json" |grep -v "grep"|awk \'{print $2}\'')[1])
         # print("get sub2 process'pid")