Correct S3 prefix for new bucket layout
Correct S3 prefix for new bucket layout

New Pivnet buckets use product-files/ as the prefix, not
product_files/ (note - vs _). As of 0.25, pivnet-resource is
not aware of the new layout. However, if you manually provide
a prefixed path, pivnet-resource uses it literally without
prefixing product_files/.

[#128340407]

Signed-off-by: Jacques Chester <8f1e729cbc4d489c19883827c4c21d9fbbde0732@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci