MFC r304040:

Redirect the output of the testcases to stderr instead of
redirecting it to /dev/null

This will aid in debugging failures

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

Fix ACL tests to correctly work with ZFS; previous version used wrong
paths.

PR: 191545
MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Adapt NFSv4 ACL regression test to the fact that the new ZFS uses
new semantics.

Make ACL tests slightly easier to run.

Add regression tests for NFSv4 ACLs and update POSIX.1e tests to the changed
error messages.