net-mgmt/py-ciscoconfparse: Update to 1.5.4

Changelog since 1.5.1:

• Introduction of new methods to the IPv4Obj()/IPv6Obj() classes and changed return values of those.

• Add support for int(), bin() and hex() on the IPv4Obj() and IPv6Obj() classes.

• Fix "packed" and "exploded" methods of IPv6Obj(), add "IPv4Obj().packed" and "IPv4Obj().exploded"