threshold monitoring for check_pupdash_nodes

[josy1024]

i've added some code in check_pupdash_nodes to make threshold monitoring possible ;-)
regards
......

get threshold monitoring for nagios/icinga

my $code;
$code = $np->check_threshold(
check => $nodes{'failed'},
warning => 1,
critical => 3,
);
$np->nagios_exit( $code, "Threshold check failed" ) if $code != OK;