SECRETS: Support 0 as unlimited for the quotas
Add a special value for all the quota-like settings that means 'no
limit'.
Because the responder also had a global limit on the size of the
accepted body (64kiB), this patch also removes the hardcoded limit and
instead keep track of the biggest quota value on startup.
Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>