Add additional commands in manager.py

[mosharaf]

For example, status or job-status to see the status of the current job; view-config to see the configuration file used. We can discuss here to come up with a list of common things someone may need.

[mosharaf]

@fanlai0990 can you please assign this to the team who were talking about shutdown command yesterday? It's broader than just shutdown but that can be a start.