[Hawkular-dev] execute op

As part of the new UI-server-feed comm work, the following now works. In our agent config, if a resource-type has an operation defined, you can execute that operation from end-to-end. I don't have the UI coded up - I mock out the UI with a simulated websocket client. These are the log messages I got in the logs to show it working: 1) The UI sends in the request over websocket - the content of the request looks like this: ExecuteOperationRequest={"resourceId":"mazztower~Local~/subsystem=hawkular-monitor", "operationName":"Status"} 2) The server receives it over the websocket. Log message: Received message from UI client [AjEP4Q3X0ViCalHvAsodkve92mshxsCxJTy9PQ9r] 3) And then puts it on the bus. Whatever server is currently connected to that feed will have a bus listener for this particular command for that particular feed and picks it up. Log message from the bus listener: Asking feed [mazztower] to execute operation [Status] on resource ID [mazztower~Local~/subsystem=hawkular-monitor] 4) That bus listener does what it needs to do - in this case, forwards the message to the appropriate feed/agent. Log message: Attempting to send async message to [1] clients: [ExecuteOperationRequest={"resourceId":"mazztower~Local~/subsystem=hawkular-monitor","operationName":"Status"}] 5) The agent gets the message from its websocket. Log messages: Received message from server Received request to execute operation [Status] on resource [mazztower~Local~/subsystem=hawkular-monitor] 6) Once the operation is executed, the results are sent back to the server - these are logs back on the server again: Received message from feed [mazztower] Operation execution completed. Resource=[mazztower~Local~/subsystem=hawkular-monitor], Operation=[Status], Status=[OK], Message=["STOPPED"] So you can see the server was told that the operation succeeded and what the results were in Message. Lots more to do. But the end-to-end is working. Need to support parameters, next. Then have to figure out how to do resource configuration using this same comm mechanism.