Move partition handling to overcloud-partition / overcloud-partition-uefi
as whole-disk images with kernel-rt would be impossible to create due to
dependencies between kernel-rt and kdump/kexec-tools. We need to be able
to create whole-disk image while some package should not be uninstalled.
Change-Id: I181cf4dc0c0976833e39e4df78a7cff184f0f0b2