More helpful console logging

[achimnol]

The current console logging (e.g., which is shown in docker logs command) has very little information helpful to the users.

• [ ] Print date/time, severity, and the source module information to each line. Optionally we could add coloring when printing to a tty.
• [ ] Print the current version and configuration summary (e.g., if UnionRemoteSet is used, show the individual remote sets) when starting up.
• [ ] Print the traceback and error message when an internal server error occurs.
• [ ] Add a knob (e.g., environment variable or CLI argument) to control log verbosity. (e.g., --debug or -vvv)
• [ ] Document the logging-related configurations.

Example:

[dahlia]

It could be achieved using the standard logging module.

[achimnol]

Yes. When I get some free time, I will make a PR for this.