gs_cache: add a temp URL handler for fake telemetry service

Adds a framework for a short term work around to handle
telemetry requests in gs_cache instead of devserver. Also
includes some minor pylint improvements.

BUG=chromium:1087989
TEST=Tested manually. Details can be found at
http://gpaste/6676068272439296

Change-Id: I9cce2c178035741caca626880d56830b6a0eaa06
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2288678
Tested-by: Sanika Kulkarni <sanikak@chromium.org>
Auto-Submit: Sanika Kulkarni <sanikak@chromium.org>
Reviewed-by: Congbin Guo <guocb@chromium.org>
Commit-Queue: Sanika Kulkarni <sanikak@chromium.org>
2 files changed