Merge branch 'mptcp-more-socket-options'

Mat Martineau says:

====================
mptcp: More socket option support

These patches add MPTCP socket support for a few additional socket
options: IP_TOS, IP_FREEBIND, IP_TRANSPARENT, IPV6_FREEBIND, and
IPV6_TRANSPARENT.

Patch 1 exposes __ip_sock_set_tos() for use in patch 2.

Patch 2 adds IP_TOS support.

Patches 3 and 4 add the freebind and transparent support, with a
selftest for the latter.
====================

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