FL-398: fix make.conf.example symlink
use gentoo-sources
FL-524: remove stage2 CHOST-changing code. It was using an older env.d format no longer used.
fix EC2 builds
add VirtualBox/Vagrant and EC2 targets
Merge branch 'funtoo'
update gcc so we don't run into missing libraries
add portage pym path with sys.path

newer portage ebuilds don't seem to install into /usr/lib/python
anymore, so we need to add /usr/lib/portage/pym to sys.path during
bootstrap
add systemd support to base image
improve systemd support
add a few more base packages
add a bunch of packages
move some packages around
use NAT port forwarding to make the build more resilient
cleanup virtualbox target
refactor handling of make.conf repos.conf wrt portage-2.2
cleanup portage mess
do not build AMIs for now
update base packages
automatically update config files