ports/146754: [patch] new port: add devel/atf framework to ports

[Garrett Cooper]

    This request has been sitting mostly idle for the last 3 months. I
realize people are busy, but could someone with some time please help
me work out any issues that might exist with this port, and commit
this to ports? There are a _lot_ of developers that would be happy to
see this committed to ports so they can add unittests for their work,
and I would like to see this committed so I can start writing real
testcases for pkg_install.
Thanks,
-Garrett