Merge an applicable subset of r263234 from HEAD to stable/10:

Merge an applicable subset of r263234 from HEAD to stable/10:

  Update most userspace consumers of capability.h to use capsicum.h instead.

  auditdistd is not updated as I will make the change upstream and then do a
  vendor import sometime in the next week or two.

Note that a significant fraction does not apply, as FreeBSD 10 doesn't
contain a Capsicumised ping, casperd, libcasper, etc.  When these features
are merged, the capsicum.h change will need to be merged with them.

Sponsored by:	Google, Inc.

git-svn-id: svn://svn.freebsd.org/base/stable/10@280250 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f