MFC r335792, r336564, r336579

r335792:
audit(4): add tests for several more administrative syscalls

Includes ntp_adjtime, auditctl, acct, auditon, and clock_settime. Includes
quotactl, mount, nmount, swapon, and swapoff in failure mode only. Success
tests for those syscalls will follow. Also includes reboot(2) in failure
mode only. That one can't be tested in success mode.

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15898

r336564:
Separate the audit(4) tests for auditon(2)'s individual commands

auditon(2) is an ioctl-like syscall with several different variants, each of
which has a distinct audit event. Write separate audit(4) tests for each
variant.

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D16255

r336579:
audit(4): add more test cases for auditon(2)

auditon(2) is an ioctl-like syscall with several different variants, each of
which has a distinct audit event. This commit tests the remaining variants
that weren't tested in r336564.

Submitted by: aniketp
X-MFC-With: 336564
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D16381

MFC r335261, r335275, r335284-r335285, r335294, r335318, r335320, r335703

r335261:
audit(4): add tests for pathconf(2) and friends

pathconf, lpathconf, and fpathconf are included

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15842

r335275:
audit(4): add tests for chflags and friends

chflags, fchflags, and lchflags (but not chflagsat) are included.

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15854

r335284:
audit(4): add tests for extattr_get_file(2) and friends

This commit includes extattr_{get_file, get_fd, get_link, list_file,
list_fd, list_link}. It does not include any syscalls that modify, set, or
delete extended attributes, as those are in a different audit class.

Submitted by: aniketpt
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15859

r335285:
audit(4): Add tests for a few syscalls in the ad class

The ad audit class is for administrative commands. This commit adds test
for settimeofday, adjtime, and getfh.

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15861

r335294:
audit(4): add tests for connect, connectat, and accept

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15853

r335318:
audit(4): add tests for extattr_set_file and friends

Includes extattr_{set_file, _set_fd, _set_link, _delete_file, _delete_fd,
_delete_link}

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15867

r335320:
audit(4): Add tests for {get/set}auid, {get/set}audit, {get/set}audit_addr

Submitted by: aniketp
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D15871

r335703:
audit(4): fix Coverity issues

Fix several incorrect buffer size arguments and a file descriptor leak.

Submitted by: aniketp
Reported by: Coverity
CID: 1393489 1393501 1393509 1393510 1393514 1393515 1393516
CID: 1393517 1393518 1393519
X-MFC-With: 335284
X-MFC-With: 335318
X-MFC-With: 335320
Sponsored by: Google, Inc. (GSoC 2018)
Differential Revision: https://reviews.freebsd.org/D16000