MFC r295341,r295345:

r295341:

Require /bin/getfacl and /bin/setfacl when running the acl tests

For cases where these utilities aren't installed, the tests would fail today
in a non-intuitive manner on sub-testcase #3 in each of the test scripts

r295345:

Use basenames for getfacl, setfacl, and zpool to work around the
fact that Jenkins hardcodes image sizes to 2GB with the FreeBSD_HEAD
job

This is to stop the unnecessary failure emails because we've gone
over the 2GB limit