OpenAPI uniformization

[henricasanova]

This is going to be annoying, but we need to make a pass through the REST API, as some things are really not consistent. For instance, for the API functions to retrieve information about ComputeService, the compute service name is passed as input in the JSON. But for other items, like Task, the task name is passed in the URL (which is more standard). We should have more info in the URLs in general since at the beginning (the proof of concept setup), everything was in the JSON