Fix and Gate on E265

pep8 E265 makes sure block comment start with '# '. Fix and gate on this
new rule as it helps improve comment readability.

In the few cases where the comment was just commented out code, remove
the comment.

Change-Id: Iea1c445df8ddc2b6c17a4ab697ad756eef2f91fa
Merge "Fix and Gate on E265"