listening sockets as non sockets

[Gleb Smirnoff]

  Hi!

  Two important updates.

1) The patch worked pretty okay, but the idea of separate file type is
   abandoned. With current filedescriptor code it is almost impossible
   to racelessly switch fileops and f_data.
   For more details read the commit message, URL below.

2) I moved the work to git. It allows for easier code sharing.

https://github.com/glebius/FreeBSD/commit/3a52df429889ea9c6e61013f6913aad95939f159

-- 
Totus tuus, Glebius.