Gating tests
    
    This commit gets rid of the existing, unused, nonworking
    and nonmaintained tests. The person who created them
    is (AFAICT) no longer with Red Hat; and the tests weren't
    being run in gating; and they aren't even in working
    condition.
    
    Replace with our standard convention: install the -tests
    package, and run it with BATS. This setup is more complex
    than podman/skopeo because we need to fire up a local
    registry before the tests begin, then tear it down at
    the end.
    
    I am expecting these tests to fail in actual gating due
    to what I believe are actual buildah problems.
    
    Signed-off-by: Ed Santiago <santiago@redhat.com>