The previous change to this file didn't raise the error up to stream_write,
and so the complete_upload function still ran because the loop was only
broken. It errored because the data was already canceled. This is better
than what we had before, which was to silently fail but report success
(even internally to ourselves!) on bad image upload.
This means we discovered a bug where a user could have failed during image
upload, but quay would write that image to the repository, potentially
writing broken images to S3.
Implement the minimal changes to the local filesystem storage driver and feed them through the distributed storage driver.
Create a digest package which contains digest_tools and checksums.
Fix the tests to use the new v1 endpoint locations.
Fix repository.delete_instance to properly filter the generated queries to avoid most subquery deletes, but still generate them when not explicitly filtered.
