livecd-creator won't cleanup on CTRL-C rpmUtils/miscutils.py catches it and exits.

[Jasper Hartline]

https://bugzilla.redhat.com/show_bug.cgi?id=619270

Anyone have any suggestions on how to proceed here with livecd-creator
catching CTRL-C
and cleanup properly or any other way to get rpmUtils/miscutils.py to
pass the trapped signals back through a callback so I can check it via
ret = self.runTransaction(cb) in yuminst.py?

Looking for a way out of this mess.