nuke stuff not necessary here
rumpkern_demo is unused, lua is run
Comment out xenif stuff.

It's not required for 100% of the tests passing, and makes it simpler
to run this domain (no host configuration required any longer).
Don't provide virtual disks.

Makes the domU start much faster.  The downside is that can't mount
persistent storage, but that's currently not used anyway.
Merge pull request #2 from anttikantee/ljsysxen

Make running the DomU faster/simpler