Fix pylint errors in bsp unit tests

Fix all non-indentation pylint errors in the bsp unit tests.
The rest of the bsp/ files have extensive changes coming up
that will also include any pylint fixes in those CLs.

Bug: 28007659
Test: `python test_runner.py` passes.
Change-Id: Ie90a8237f782510789689e06da09780ba4c12926
4 files changed