Bring setting and reading stream status into alignment

[FragLegs]

When you read a stream's status (GET), you get back a response with two fields:

• status
• reason

When you set a stream's status (POST), you send an object with three fields and get the same object back:

• stream_id
• status
• reason

Transmitter code would be cleaner if the GET endpoint also returned a stream_id in the response object.