SECRETS: Add a new option to control per-UID limits
Adds a new option max_uid_secrets that allows to set a limit of secrets
for this particular client so that the user cannot starve other users.
Resolves:
https://pagure.io/SSSD/sssd/issue/3363
Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>