Task: Add support for control_plane to support GET commands

[Ulrond]

Goal

• Add a callback to the control plane to support GET commands

Problem

For the use case where the control module has to support / mimics external subsystems, you need to be able to extract the data from the REST_API..

E.g. the HDMI CEC Use-case where GET internal control logic from the network on the HDMI CEC and mimic the support that a HDMI CEC Controller would have, e.g. the Pulse 8.

self.hdmiCECController.checkMessageReceived(deviceLogicalAddress, destinationLogicalAddress, cec, payload=payload)

• When you perform a HTTP GET on the websocket, from the server side ,you need to implement a callback to decode the request, fill it out, and return the data as requested back through the websocket to the client.

Notes (Optional)

• Write test cases to support the GET send receive decoding as required
• In the callback for the GET command you have to encode a YAML / JSON response, ( depending on the GET Request because it sends in a specific format ), you need to create a response in the format based on the GET request.
• Consider kvp may need to be upgraded so that you can created YAML / JSON data to send back as an object? -> Spin off new ticket for this