make debug shell survive switch-root

move system-upgrade-shell.service to /run/systemd/system so it will
still be present after we switch-root.
request loop.ko, for --iso upgrades (#1024223)

The F20 kernel builds loop.ko as a module, and nothing in dracut
requests loop.ko, so we end up unable to loop-mount anything.

We need that to support --iso upgrades, so make sure it's present.
drop unused move-journal.sh

This script isn't being used, and it doesn't actually work anyway, so
let's drop it.