tests: Make postmaster/002_connection_limits deal verbose logs

When log_error_verbosity=verbose is configured the test would hand (and then
fail), because of the sqlstate being added between log level and message. Make
regex cope.

Reported-by: Andrew Dunstan <andrew@dunslane.net>
Discussion: https://postgr.es/m/c7ba6bd0-3701-43d1-9087-017777fe9cd2%40dunslane.net

src/test/postmaster/t/002_connection_limits.pl

@@ -66,7 +66,7 @@ sub connect_fails_wait
 	my $log_location = -s $node->logfile;
 
 	$node->connect_fails($connstr, $test_name, %params);
-	$node->wait_for_log(qr/DEBUG:  client backend.*exited with exit code 1/,
+	$node->wait_for_log(qr/DEBUG:  (00000: )?client backend.*exited with exit code 1/,
 		$log_location);
 	ok(1, "$test_name: client backend process exited");
 }