fix(core_roller_upload): Use new payload names and upload path.
fix(core_roller_upload): Use new payload names and upload path.

As of 4e85b172 the build system generates the update payload using the
coreos_production_update prefix, so use that instead. Use the release
version in the storage path instead of a disk image MD5; the version is
sufficiently unique and the no need for the obfuscation.

Drop the disk image copy in the download storage that I tacked in, that
will go into a new core_promote script that I have written but not
tested yet (need an alpha release to promote!!).

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