fix(make_chroot): Add new repos.conf and crossdev metadata
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.

mischief/scripts,endocode/scripts,smilart/scripts,gtank/scripts,sigma/coreos-scripts,mischief/scripts,andrejro/coreos--scripts,BugRoger/scripts,mischief/scripts,BugRoger/scripts,endocode/scripts,sigma/coreos-scripts,endocode/scripts,zhang0137/scripts,marineam/coreos-scripts,vmware/coreos-scripts,trnubo/scripts,coreos/scripts,fivethreeo/scripts,mjg59/scripts,nicescale/scripts,smilart/scripts,fivethreeo/scripts,smilart/scripts,fivethreeo/scripts,marineam/coreos-scripts,mjg59/scripts,glevand/coreos--scripts,vmware/coreos-scripts,zhang0137/scripts,mjg59/scripts,nicescale/scripts,gtank/scripts,trnubo/scripts,gtank/scripts,sigma/coreos-scripts,coreos/scripts,marineam/coreos-scripts,BugRoger/scripts,andrejro/coreos--scripts,nicescale/scripts,glevand/coreos--scripts,zhang0137/scripts,vmware/coreos-scripts,trnubo/scripts,andrejro/coreos--scripts