Use Python 3.x compatible print syntax

Adding an extra pair of braces helps here to
let Python 3.x interpret it as print function,
while not confusing the Python 2.x print operator.

Change-Id: I05af267ecfbcc80753726743fdf82c330350afcb
Fix and enable H401

Remove leading spaces from doc comments.

Change-Id: I75b055c0d64dda478c63839d44158e301900107f
Merge "Use Python 3.x compatible print syntax"
Merge "Fix and enable H401"