sysdb_sudo: Enable LDAP time format compatibility
LDAP specification allows to ommit seconds and minutes
in time border definition. In that case they defaults to zeros.
Current sssd.sudo implementation requires precision up to
seconds in time definition. This commit allows to lower
the precision up to hours.
Resolves:
https://pagure.io/SSSD/sssd/issue/4118
Reviewed-by: Pavel Březina <pbrezina@redhat.com>