floppy: bail out in open() if drive is not responding to block0
read (bnc#773058).
- Refresh Xen patches (fix PV driver build).
Drop the _constraints file, we are using the prjconf setting for now
Linux 3.13.1.
Reformat the spec files to what the buildservice expects
Merge branch 'packaging'

Conflicts:
	rpm/kernel-source.spec.in
rpm/kernel-binary.spec.in: Require 'modutils' also in the subpackages
Merge branch 'packaging'
- avoid double /sys mounts for kernel-obs-build, OBS is doing this meanwhile