Remove machine-id on pre generated images so it's unique on each deployed device
As referenced on the arm list [1] and as already being done on the docker image we
should remove the unique /etc/machine-id file on compose artifacts to ensure it's
regenerated and unique on each deployed host/device. This unifies the process across
all base ks so it's inherited for each artifact.
[1] https://lists.fedoraproject.org/archives/list/arm@lists.fedoraproject.org/message/Q3YZVF5P2OLLPUJQ2LYZSTKWGGDIU6QO/
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>