- make sure splash is deactivated for any dialogs displayed
  while inside the kiwi initrd (bnc #812099)
- fixup the openNebula example for 12.3
  - use grub2 as bootloader
  - switch the branding packages
  - fixup the custom firstboot procedure to avoid an error
- follow up fix for 12.3 openNebula examples:
  + grub2-branding has to stay installed inside the initrd
  + no theme was selected
- call syncGPT only if partedTableType is gpt