[9.18] chg: test: Downgrade "timeout" and "attempts" arguments in shutdown

The shutdown system test sends queries when named is shutting down, not
in an attempt to get answers but to destabilize the server into a crash.
With isctest.query.udp() defaulting to try up to ten times with a
ten-second timeout to get a response we don't care about from a likely
terminated server, we make the test run much longer than needed because
of retries and long timeouts.

Also, see isc-projects/bind9#4943.

Backport of MR !9507

Merge branch 'backport-mnowak/shutdown-downgrade-timeout-and-attempts-arguments-9.18' into 'bind-9.18'

See merge request isc-projects/bind9!9542

bin/tests/system/isctest/query.py

@@ -39,14 +39,14 @@ def generic_query(
     for attempt in range(attempts):
         try:
             isctest.log.debug(
-                f"{generic_query.__name__}(): ip={ip}, port={port}, source={source}, "
+                f"{query_func.__name__}(): ip={ip}, port={port}, source={source}, "
                 f"timeout={timeout}, attempts left={attempts-attempt}"
             )
             res = query_func(message, ip, timeout, port=port, source=source)
             if res.rcode() == expected_rcode or expected_rcode is None:
                 return res
         except (dns.exception.Timeout, ConnectionRefusedError) as e:
-            isctest.log.debug(f"{generic_query.__name__}(): the '{e}' exceptio raised")
+            isctest.log.debug(f"{query_func.__name__}(): the '{e}' exceptio raised")
         time.sleep(1)
     raise dns.exception.Timeout
 

bin/tests/system/shutdown/tests_shutdown.py

@@ -101,7 +101,11 @@ def do_work(named_proc, resolver_ip, instance, kill_method, n_workers, n_queries
 
                 qname = relname + ".test"
                 msg = dns.message.make_query(qname, "A")
-                futures[executor.submit(isctest.query.udp, msg, resolver_ip)] = tag
+                futures[
+                    executor.submit(
+                        isctest.query.udp, msg, resolver_ip, timeout=1, attempts=1
+                    )
+                ] = tag
             elif shutdown:  # We attempt to stop named in the middle
                 shutdown = False
                 if kill_method == "rndc":