- added cleanup code for /var/cache/kiwi/zypper/repos
  kiwi should only use the relevant .repo files according to the
  repositories specified in the XML description
- added gfxboot-branding-SLES package to SLES JeOS image template
  when building install media we want graphics :-)
- Added in code debug switch for grub2
  Currently grub2 debugging is switched off by default but for
  getting more information while grub2 loads it's useful to
  activate the debug flag by commenting out the line in the code
- Removed static eth0 dhcp network setup from JeOS 13.1/13.2/SLE12
  templates. Reason for the change is that network device names are no
  longer persistent starting with openSUSE 13.1. Thus we don't know about
  the device at build time and cannot safely provide an ifcfg-<device>
  configuration.