L2SS-873: Collect mock args that also works with 3.7

tangostationcontrol/tangostationcontrol/test/clients/test_snmp_client.py

@@ -173,8 +173,7 @@ class TestSNMP(base.TestCase):
                     # get a value to compare the value we got against
                     checkval = server.val_check(i, server.DIM_LIST[j])
 
-                    res_lst = [call.args[1] for call in hlapi.ObjectType.call_args_list if call.args]
-
+                    res_lst = [args[1] for args, _ in hlapi.ObjectType.call_args_list if args]
                     if len(res_lst) == 1:
                         res_lst = res_lst[0]