Userspace library for Chelsio's Terminator 5 based iWARP RNICs (pretty
much every T5 card that does _not_ have "-SO" in its name is RDMA
capable).

This plugs into the OFED verbs framework and allows userspace RDMA
applications to work over T5 RNICs.  Tested with rping.

Obtained from:	Chelsio Communications
Relnotes:	Yes
Sponsored by:	Chelsio Communications
make this compile on arm...  bus_size_t is not size_t, and it has
different sizes on different arches...
Implement better handling for ENOSPC error for both CTL and CAM.

This makes VMWare VAAI Thin Provisioning Stun primitive activate, pausing
the virtual machine, when backing storage (ZFS pool) is getting overflowed.

MFC after:	1 week
Sponsored by:	iXsystems, Inc.
Fix the logic inversion in the previous commit by ensuring that the matched
expression (:M) is empty, not the not matched (:N) is empty. The former case
means we have not found the TEST_SUBDIR value in SUBDIR

Reported by: rodrigc
X-MFC with: r273803
Pointyhat to: me (did not use a clean install root)
Sponsored by: EMC / Isilon Storage Division
Merge remote-tracking branch 'freebsd/master' into hardened/current/master