hack(sdk_lib/make_chroot.sh): save functions.sh
hack(sdk_lib/make_chroot.sh): save functions.sh

we remove openrc which provides /etc/init.d/functions.sh. Unfortunatly
other things rely on this file. Stash it away in /tmp/ then restore it
for now.

Change-Id: I18a59e05ecdf08cc8a560b29049c8d25ac1bf5a3

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