Moves the content fetching into the unpack process
and defers the download until the snapshot needs it
and is ready to apply. As soon as a layer is reached
which requires fetching, all remaining layers are
fetched.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
Avoid directly handling media types with "+" attributes,
instead handling the base and passing through the full
media type to the appropriate stream processor or decompression.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
