Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

audit(4): Fix file descriptor leaks in ATF tests

Submitted by: aniketp
Reported by: Coverity
CID: 1393343 1393346 1392695 1392781 1391709 1392078 1392413
CID: 1392014 1392521 1393344 1393345 1393347 1393348 1393349
CID: 1393354 1393355 1393356 1393357 1393358 1393360 1393362
CID: 1393368 1393369 1393370 1393371 1393372 1393373 1393376
CID: 1393380 1393384 1393387 1393388 1393389
MFC after: 2 weeks
Sponsored by: Google, Inc (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15782

audit(4): Add tests for the fr class of syscalls

readlink and readlinkat are the only syscalls in this class. open and
openat are as well, but they'll be handled in a different file. Also, tidy
up the copyright headers of recently added files in this area.

Submitted by: aniketp
MFC after: 2 weeks
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15636

Add initial set of tests for audit(4)

This change includes the framework for testing the auditability of various
syscalls, and includes changes for the first 12. The tests will start
auditd(8) if needed, though they'll be much faster if it's already running.
The syscalls tested in this commit include mkdir(2), mkdirat(2), mknod(2),
mknodat(2), mkfifo(2), mkfifoat(2), link(2), linkat(2), symlink(2),
symlinkat(2), rename(2), and renameat(2).

Submitted by: aniketp
MFC after: 2 weeks
Sponsored by: Google, Inc (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15286