- added missing setup of etc/sysconfig/bootloader setup for grub2
- fixed possible duplicate entries for quiet and splash= in
  etc/default/grub
- remove the <opensusePattern> and <rhelGroup> elements from the schema
  these elements are replaced by the new <namedCollection> element
- update all XML files to the latest schema version (5.7)
- move from opensusePattern to namedCollection in KIWIMigrate
- fixed typo in function comment, still talking about
  opensusePattern instead of namedCollection