Update spec

The spec is now using a base image and edit-node to build the image.
Previously the image was build from scratch.

Change-Id: I4cc0c231f3af647490e497abe3bd25f3323ff2fe
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>
Simplify Makefile

Change-Id: Id43a902ae107214f1cc47c715179c5ec3baa1660
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>