build_torcx_store: add package 'url' location
build_torcx_store: add package 'url' location

This also moves the 'torcx' prefixing logic over to the torcx upload
root introduced in the release util library.

It also corrects a bug in how the source package was being determined.

glevand/coreos--scripts,glevand/coreos--scripts,coreos/scripts,coreos/scripts