Add support for IPv6 based addresses as part of the TCP unify portspace feature

Add support for IPv6 based addresses as part of the TCP unify portspace feature
in ibcore. This resolves an interopability issue when using both iWarp(T6) and
RDMA(CX-4 and CX-5) devices at the same time.

The problem is IPv4 based sockets cannot be bound to an IPv6 based address
causing sobind() to fail preventing all use of IPv6 based addresses with RDMA
when an iWarp device is present.

This is a direct commit.

Tested by:	KrishnamRaju ErapaRaju <Krishna2@chelsio.com>
Sponsored by:	Mellanox Technologies

git-svn-id: svn://svn.freebsd.org/base/stable/10@326704 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f