Suppress Dash server reminder

[anders-kiaer]

In one of the recent versions of Dash, Dash gives a reminder/warning like this:

Dash is running on https://localhost:5000/

    INFO:       Dash is running on https://localhost:5000/

 Warning: This is a development server. Do not use app.run_server
    INFO:        Warning: This is a development server. Do not use app.run_server
 in production, use a production WSGI server like gunicorn instead.

    INFO:        in production, use a production WSGI server like gunicorn instead.

 Opening the application (https://localhost:5000) in your browser.
 Press CTRL + C in this terminal window to stop the application.

This confuses the users, as they only will use the commandline version of webviz on localhost anyway. Suppress the reminder from dash (as we already have done for flask for some time).