Adds a family argument which allows to request link dumps for a certain
address family. This allows to f.e. dump ipv6 specific statistics and data.
nl-link-list --family inet6
- parse IFLA_IFALIAS if available
- provides API to access/change ifalias
rtnl_link_get_ifalias(link)
rtnl_link_set_ifalias(link, alias)
- extends nl-link-set to test functionality