koji spin-livecd issues

[Doug Reiland]

I got  a minimal livecd to build (not tested yet) but a to make some
kojid changes. Are these really bugs or should be handled elsewhere?

I had to include '/dev/shm' in bind_opts
Also, livecd-creator (imgcreator python package) was calling
os.random() and that wanted '/dev/urandom', so I had to a mknod for
that where loop? nodes are created.

Also, I had to include device-mapper in the livecd-build group.

Doug