Merge branch 'listener_refactor_part_11'

Eric Dumazet says:

====================
inet: tcp listener refactoring, part 11

Before inserting request sockets into general (ehash) table,
we need to prepare netfilter to cope with them, as they are
not full sockets.

I'll later change xt_socket to get full support, including for
request sockets (NEW_SYN_RECV)

Save 8 bytes in inet_request_sock on 64bit arches. We'll soon add
a pointer to the listener socket.

I included two TCP changes in this patch series.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>