bootserver: add 750G installer
bootserver: rename 2T installer to 2000G
bootserver: skip degraded raid confimartion on install
bootserver: cleanup preseed file
bootserver: create boot-partition outside lvm
bootserver: add common preseed file
bootserver: use common preseeds from disk-size specifc preseed file
bootserver: replace the manual preseed with the common one
bootserver: simple preseed install script