Cygwin: AF_UNIX: Redesign various aspects

* Change set_socket_type/get_socket_type to virtual methods
* Move various variables into af_unix_shmem_t
* Change sun_name_t to match new usage pattern
* Move shut_state definition and add a name for the 0 value
* Allow marking packet as administrative packet.  This allows
  filtering out info packets exchange between peers and tweak
  data accordingly.
* Rename send_my_name to send_sock_info and send credentials
  if not called from bind (so the socket was already connected)
* Handle SO_PASSCRED in setsockopt/getsockopt
* Add input size checking to setsockopt/getsockopt
* Use NT functions where appropriate

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

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