Max ticket life and renewable life are printing as negative values

[ehashman]

Presumably this is because the delta is being calculated backwards, per https://github.com/russjancewicz/python-kadmin/blob/cc1fd8979ad5901669fde6057e01f4a62bc3b1f9/src/PyKAdminPrincipalObject.c#L146 (argument order should be swapped)