Allow CMS editing of ports, provider, tests
Allow CMS editing of ports, provider, tests

Though xblock-utils only supports editing of list fields as
JSON-in-a-string, it works.

arbrandes/hastexo-xblock,arbrandes/hastexo-xblock,arbrandes/hastexo-xblock,hastexo/hastexo-xblock,arbrandes/hastexo-xblock,hastexo/hastexo-xblock,hastexo/hastexo-xblock,arbrandes/hastexo-xblock,hastexo/hastexo-xblock