Provide more orchestrator node information in /web/status

[sjmudd]

If you select the output of the http interface of orchestrator and look at: http://xxx:3000/web/status you see a list of the orchestrator nodes. While not alway absolutely important there is no vision here of which version each node is running. Most of the time you'd expect them to be the same but if you run more than one node then being able to see this explicitly would be good.

So I would like to see added to the list of available nodes a couple of extra columns:

• the version of orchestrator that is running
• the port on which it is listening. That may be expected to be the default but may not be. If proxies are involved or load balancers then this may not match the actual port you are connecting to.
• the uptime of each node in a human readable format. Again it's convenient to see if (all) nodes have been running for the same time.

None of this may be desperately urgent but it is handy to have.