iflib proposed merge D5211

[Matthew Macy]

https://reviews.freebsd.org/D5211



Documentation of varying degrees of completeness and out-of-dateness can be found at:

https://github.com/NextBSD/NextBSD/wiki/Introduction-to-the-Iflib-Draft-API

https://github.com/NextBSD/NextBSD/wiki/DD-packet-transmit-and-receive-functions

I intend to at least have complete online documentation in the next week. Proper man pages are TBD.

-M