Finalise new EthernetInterfaces functions
Finalise new EthernetInterfaces functions

- Add get_mac, get_fqdn, get_ipv4, get_ipv6.

uggla/python-redfish,bcornec/python-redfish,bcornec/python-redfish,uggla/python-redfish,uggla/python-redfish,bcornec/python-redfish