OpenTracing

[namliz]

As first steps it would be nice to instrument cncfdemo-cli, as it is a short & simple python script.
Appdash could be containerized and deployed unto a cluster as part of the demo to receive traces.

One open question currently is that Appdash will become available a few minutes _after_ the script is started. Hopefully its possible to patch the remote controller endpoint on the fly somehow or do some trickery.