Refactor: python: Improve arguments passed to Process.init.

• Get rid of the triggers_reboot argument. It's unused except in a single debug logging statement, and appears to always be False.

• Get rid of the process argument. This is never passed - only name is. We can use that for both purposes. Also stop calling str() on name. It's only ever given a string in the first place.

• Callers should pass a boolean for dc_only.

• Don't use an empty list as the default argument. Instead, use None and then set each variable to an empty list if None is passed.