fix case

tests/system-test/0-others/user_control.py

+import taos
+import sys
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+
+PRIVILEGES_ALL      = "ALL"
+PRIVILEGES_READ     = "READ"
+PRIVILEGES_WRITE    = "WRITE"
+
+class TDTestCase:
+
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+
+    def create_user_current(self):
+        for i in range(self.users_count):
+            tdSql.execute(f"create user test{i} pass 'taosdata{i}' ")
+
+    def grant_user_privileges(self, dbname):
+        return "grant "
+
+
+    def run(self):
+        self.users_count = 5
+        tdSql.execute("")
+
+
+
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())