BackgroundPsql's set_query_timer_restart() may not work

Hi,

While adding some TAP tests, I realized that set_query_timer_restart()
in BackgroundPsql may not work. Specifically, it seems not to work
unless we pass an argument to the function. Here is the test script I
used:

use strict;
use warnings;
use PostgreSQL::Test::Cluster;
use PostgreSQL::Test::Utils;
use Test::More;

my $node = PostgreSQL::Test::Cluster->new('main');
$node->init;
$node->start;

$PostgreSQL::Test::Utils::timeout_default = 5;
my $bg_psql = $node->background_psql('postgres', on_error_stop => 1);

$bg_psql->query_safe("select pg_sleep(3)");
$bg_psql->set_query_timer_restart();
$bg_psql->query_safe("select pg_sleep(3)");
$bg_psql->quit;
is(1,1,"dummy");

$node->stop;
done_testing();

If calling set_query_timer_restart() works properly, this test would
pass since we reset the query timeout before executing the second
pg_sleep(3). However, this test fail on my environment unless I use
set_query_timer_restart(1) (i.e. passing something to the function).

Currently authentication/t/001_password.pl is the sole user of
set_query_timer_restart() function. I think we should define a value
to query_timer_restart in set_query_timer_restart() function even if
no argument is passed, like the patch attached, or we should change
the caller to pass 1 to the function.

Regards,

--
Masahiko Sawada
Amazon Web Services: https://aws.amazon.com