fix(coreos-base/bootengine): change to build single image

don't build an image for every boot kernel, just build a single
uncompressed image and put it in /usr/share/bootengine/bootengine.cpio.
fix(coreos-base/bootengine): don't hardcode ${ROOT}

use the ${ROOT} variable instead of hard coding our own right here.
chore(vboot_reference): strip out a lot of unneeded logic

we essentially only use vboot_reference for cgpt right now. Strip
everything else out.
feat(coreos-base/vboot_reference): bump to get cgpt next

bump to get the cgpt next utility
fix(vboot_reference): mask vboot-9999

bad mistake unmasking this. Reset the mask.
add(sys-devel/sysroot-wrappers): Add new sysroot-wrappers tool.

This replaces the previous sysroot wrapper scripts that was bundled with
the Google toolchain. This one is implemented in a more generic manner
and based on ccache. Perhaps other custom wrapper scripts will
eventually move into this package as well.
feat(sys-kernel/coreos-bootkernel) bump version and add initrd to built kernel image
feat(sys-kernel/coreos-bootkernel) fix up the cpio file location

This lets us rely on the kernel configuration, and not have to edit it
"by hand" with the location of the cpio file, as the cpio initrd is now
placed within the kernel output directory, where the build system picks
it up automatically.
feat(sys-kernel/dracut) update to 029 version

The --host-only option is needed, as well as the other fixes in this
release.
feat(coreos-base/bootengine) properly build the cpio image with out breaking /dev

This fixes the "create /dev/null" bug and builds the cpio image
successfully that the boot kernel needs to install.
fix(coreos-base/update_engine): remove the au-key

Update engine, rightfully, expects that if there is an au-key then it
should use it. This is a sound theory and we insert the key when we sign
anyways so remove this key for now.
chore(coreos-installer): fixup the header details
feat(coreos-installer): install coreos- prefixed commands
fix(coreos-installer): fixup deps in -9999 ebuild

the verity package moved to coreos. Fix.
chore(coreos-installer): use the symlink style versioning
bump(coreos-installer): get the lastest version

this introduces the new coreos-setgoodroot code
bump(update_engine): use coreos-setnextroot
fix(virtual/linux-sources): fixup metadata
feat(coreos) add bootkernel to build

This adds the bootkernel to the full system build and moves the
kexec-tools dependancy to the bootengine ebuild, where it belongs.
fix(coreos-base) properly bump the ebuild numbers for bootengine and coreos