fix(sys-apps/portage): move portage into our tree

I had to patch portage to fix a bug with gmerge. This patch is in
files/resolver-output-check-for-None-mainRepo.patch and has been
accepted upstream:

https://bugs.gentoo.org/show_bug.cgi?id=462528
fix(coreos-base/coreos): add wget, remove flashrom tools

add wget for binpkg fetching and remove flashrom tools