fix formatting/lint issues pointed out by repohooks

Previous changes resulted in some complaints about formatting
and Python 3 compatibility from the repo hooks. This change fixes
those.

BUG=None
TEST=repo upload --cbr .  # check that it no longer complains

Change-Id: I99cc51dcb8d499d59b7b47817f4cef8fa6ba5059
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2419831
Tested-by: Bob Haarman <inglorion@chromium.org>
Reviewed-by: Manoj Gupta (OoO) <manojgupta@chromium.org>
4 files changed