fix(build_image): Only use 'alpha' group in official builds.
Merge pull request #222 from marineam/group

fix(build_image): Only use 'alpha' group in official builds.
fix(set_lsb_release): Set bug report url.
Merge pull request #225 from marineam/bugs

fix(set_lsb_release): Set bug report url.
feat(vm_image_util): Adding support for openstack and brightbox

Added USE flags for specifying the provider (ec2, openstack, or brightbox).
Merge pull request #224 from crawford/oems

feat(vm_image_util): Adding support for openstack and brightbox
fix(make_chroot): Add new repos.conf and crossdev metadata

The latest release of portage uses repos.conf, so generate that
file when making the chroot. The crossdev overlay also needed
repo_name and layout.conf files.