Clean up devserver.py to match lint rules.

We've recently implemented increased lint checking for uploads. This CL
cleans up the devserver.py script to match those lint requirements.

BUG=None
TEST=Lint/quick manual test/devserver_integration_test
     (passes all tests that passed before).

Change-Id: Ic69b468b8cab3cc25e9ee4d5cd3709efc3c7f8e5
Reviewed-on: https://chromium-review.googlesource.com/181841
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
Tested-by: Don Garrett <dgarrett@chromium.org>
1 file changed