and upcoming 11ac.

This includes an ath(4) update, some run(4) 11n support, 11n for otus(4),
A-MPDU, A-MSDU, A-MPDU+A-MSDU and Fast frames options, scanning fixes,
enhanced PRIV checks for jails, restored parent device name printing,
improvements for upcoming VHT support, lots of under-the-hood infrastructure
improvements, new device ID, debug tools updates, some whitespace changes
(to make future MFCs easier).

This does not include (most) epoch(9) related changes as too much other
infrastructure was not merged for that.

Tested on:	some ath(4) AP, run(4) STA, and rtwn(4) STA
Discussed with:	adrian (extremely briefly)
Sponsored by:	Rubicon Communications, LLC (d/b/a "Netgate") [partially]