tests: declate alignmentScanTests as broken

More often then not,

    alignmentScanTests.AlignmentScanTests.test_aligned_image
    alignmentScanTests.AlignmentScanTests.test_unaligned_image

fail on our Jenkins slaves with the message

    libguestfs: error: could not connect to libvirt (URI = NULL): Failed to connect socket to '/run/user/1001/libvirt/libvirt-sock': Permission denied [code=38 domain=7]

Mark them as broken until we understand the issue better.

Change-Id: Ic64c0c5a19c5b207ef6c00fcbb247ac39d975a88
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21871
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>