Prevent creation of custom /etc/ImagePackages file for the
oem and vmx image types. The information there is created
at image creation time already and the call increases the
first boot time, related to (bnc #893368)
Don't prevent the pre-init stage if root= is set in the cmdline

If a root= information is passed to the cmdline kiwi uses this
device and wrongly indicates the system has completed the first
boot by setting LOCAL_BOOT=yes This prevents the correct setup
of the bootloader device.map as well as the bootloader config
to be written (bnc #893368)