Updated all docstrings to be PEP257 complaint.

Used pep257 from pypi to verify changes:
https://pypi.python.org/pypi/pep257

Didn't add any docstrings only made already existing complaint,
so the script is still posting D102 errors (D102: Docstring missing).

Change-Id: I8e07842dc3a08eba4e91bbf9d831f4f3cb9b9a4c