* Reformat sdk only using the new yapf config.
* Reformat docstrings using docformatter.
* update golden files to resolve diff caused by whitespaces
* fix some tests
* format .py files under sdk/python/tests using yapf
* additional docformatter
* fix some tests
Made all SDK import relative so that they files always refer to the sibling files instead of the installed package. This makes debugging and development easier since you can be sure the correct files are used.