Revert "scripts: Make release images include default configuration"

This reverts commit 1fa749165e4521988305910b3a771927f71520a0. We don't
want to automatically pull the CLI, for example, for Redis appliances.
Switch back to requiring release images to explicitly specify their
dependencies.

Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>