check_lenghtydrupalcron: support checking for curl style cron.php as well as drush cron

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>
check_lenghtydrupalcron: shorten the service description, host_name is redundant

Signed-off-by: Christophe Vanlancker <christophe.vanlancker@inuits.eu>