Merge branch 'listener_refactor'

Eric Dumazet says:

====================
inet: tcp listener refactoring, part 10

We are getting close to the point where request sockets will be hashed
into generic hash table. Some followups are needed for netfilter and
will be handled in next patch series.
====================

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