Co-mingling two things here:

  * Addressing some feedback from Konstantin and Kyle re: jail,
    capability mode, and a few other things
  * Adding audit support as promised.

The audit support change includes a partial refresh of OpenBSM from
upstream, where the change to add shm_rename has already been
accepted. Matthew doesn't plan to work on refreshing anything else to
support audit for those new event types.

Submitted by:	Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by:	kib
Relnotes:	Yes
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D22083