feat(prod_image_util): Moving ld.so configs to /usr
feat(prod_image_util): Moving ld.so configs to /usr

Moving the ld.so configs to /usr and symlinking them to /. This allows
images with a tmpfiles root (e.g. PXE) to have ld.so config support.

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