Revert "Add an endpoint to restage the app"

This reverts commit 4ff4b9cadf38a809c6a8473d8d961b994580b995.

Signed-off-by: Phan Le <ple@pivotallabs.com>
Add back in the build_artifacts_cache_download_uri, because it is not always a cc endpoint

Signed-off-by: David Varvel <dvarvel@pivotallabs.com>
diego: pass environment variables as array of hashes, not array of arrays