"fix an error in test case "

fix an error in test case about "tao_consume is called too frequently so that the interval between them is less than the interval set in taos_subscribe."

tests/pytest/tools/taosdemoAllTest/taosdemoTestSupportNanosubscribe.py

@@ -79,7 +79,7 @@ class TDTestCase:
 
 
         # merge result files
-        sleep(20)
+        sleep(5)
         os.system("cat subscribe_res0.txt* > all_subscribe_res0.txt")
         os.system("cat subscribe_res1.txt* > all_subscribe_res1.txt")
         os.system("cat subscribe_res2.txt* > all_subscribe_res2.txt")
@@ -99,7 +99,7 @@ class TDTestCase:
         # insert extral data     
         tdSql.execute("use subnsdb")
         tdSql.execute("insert into tb0_0 values(now,100.1000,'subtest1',now-1s)")
-        sleep(10)   
+        sleep(15)   
 
         os.system("cat subscribe_res0.txt* > all_subscribe_res0.txt")
         subTimes0 = self.subTimes("all_subscribe_res0.txt")