kn func run: for Python does not show any message for the user to know that it is running

[nainaz]

As a Function Author, when I am using command kn func run for python language/runtime, I should be able to discern that server is started so that I know the function is ready to be used.

GIVEN I am running newly create Python function
WHEN I issue 'kn func run' command
THEN I see that my function is running and ready to be called.

[sferich888]

You should see Serving on http://0.0.0.0:8080/ in the logs, which is the standard message from the wsgi server (waitress: https://docs.pylonsproject.org/projects/waitress/en/latest/runner.html) see this code