[opensuse-buildservice] [PATCH] improve kiwi system image building in Build Service

Please find attached two patches, that improve the kiwi system image building in the Build Service. The first patch adds code to build to create a tar.bz2 from the kiwi results, the second patch adds support to bs_publish to also publish the results. I have also added those patches to https://bugzilla.novell.com/show_bug.cgi?id=472018 Feedback welcome! Best, Christoph -- Christoph Thiel, Tech. Project Management, Research & Development SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)