MFC r289446:

Integrate tools/regression/acltools into the FreeBSD test suite as tests/sys/acl

- Make the requirements more complete for the testcases
- Detect prerequisites so the tests won't fail (zfs.ko is loaded, zpool(1)
is available, ACL support is enabled with UFS, etc).
- Work with temporary files/directories/mountpoints that work with atf/kyua
- Limit the testcases to work on temporary filesystems to reduce tainting the
test host

Reviewed by: trasz (earlier version)
Differential Revision: https://reviews.freebsd.org/D3810

Integrate tools/regression/acltools into the FreeBSD test suite as tests/sys/acl

- Make the requirements more complete for the testcases
- Detect prerequisites so the tests won't fail (zfs.ko is loaded, zpool(1)
is available, ACL support is enabled with UFS, etc).
- Work with temporary files/directories/mountpoints that work with atf/kyua
- Limit the testcases to work on temporary filesystems to reduce tainting the
test host

MFC after: 2 weeks
Reviewed by: trasz (earlier version)
Differential Revision: https://reviews.freebsd.org/D3810

Integrate tools/regression/acltools into tests/sys/acl

Apply patches I've been running for months on my GitHub project

Integrate tools/regression/acltools into tests/sys/acl

Apply patches I've been running for months on my GitHub project

Integrate more tests into the FreeBSD test suite from tools/regression, etc

Add ACL fuzzer. It's not used by the regression tests right now,
but I'd prefert to have it here, so it won't get lost.