feat(coreos-base/oem-pxe): introduce the PXE oem

simple OEM for PXE. Simply has an oem-release file.
feat(coreos-base/coreos-init): add ssh-key-proc-cmdline

adds the sshkey= feature on the kernel commandline
Merge pull request #172 from philips/pxe-initial

introduce the PXE oem
feat(sys-kernel/x86_64_defconfig) enable EFI in the kernel build

This builds the kernel as an EFI image, allowing it to be booted
directly by UEFI bioses.  It also enables the efivars and efivarfs
modules so that EFI variables can be accessed properly when booted in
EFI mode.
Merge pull request #181 from gregkh/kernel_update

feat(sys-kernel/x86_64_defconfig) enable EFI in the kernel build
fix(sys-apps/baselayout): Sync baselayout with recent Gentoo updates.

baselayout no longer depends on openrc upstream so remove our
openrc/efunctions use flag and dependency. Depend on efunctions in
coreos-base instead.

Remove os-release and roll back gentoo-release since customizing them is
now handled by the set_lsb_release.
cleanup(sys-apps/baselayout): Remove old functions.sh from baselayout-1
fix(sys-apps/baselayout): Don't install /etc/issue on target systems.

This is handled in /run by coreos-init scripts.
bump(coreos-base/coreos-init): Bump to version with dynamic issue file.