PEP8 MR2 E2xx: whitespace

I am trying to make Samba Python code follow PEP8 code style with autopep8.

To avoid making monster commit, I will make MR by Error Code groups.

This Merge Request is based on PEP8 MR1 E1xx: indentation

It includes the fixes from autopep8 for whitespace(error codes E2xx).

Following MRs are coming based on this one.