Add code to be able to set default kinit lifetime
This is done by setting the kinit_lifetime option in default.conf
to a value that can be passed in with the -l option syntax of kinit.
Signed-off-by: Simo Sorce <email@example.com>
Reviewed-By: Pavel Vomacka <firstname.lastname@example.org>
Reviewed-By: Alexander Bokovoy <email@example.com>