Merge branch 'lsfd-packet' of https://github.com/masatake/util-linux

Merge branch 'lsfd-packet' of https://github.com/masatake/util-linux

* 'lsfd-packet' of https://github.com/masatake/util-linux:
  tests: (lsfd) add more cases for packet sockets
  tests: (mkfds) don't specify a protocol in connect(2) for AF_PACKET socket
  lsfd: (man) write more about NAME column
  lsfd: use extra information loaded from /proc/net/packet
  lsfd: add a helper function decoding interface indexes
  lsfd: make items in netns_tree extensible
  lsfd: simplify functions for comparing items
  lsfd: (style) reformat colinfo array