devserver: Use chromite's logging library

We're removing cherrypy_log_util.py and its better to just use the
chromite's version of logging.

BUG=b:186066529
TEST=./devserver.py

Cq-Depend: chromium:2856532
Change-Id: Ibec85bb3f789baf831666c04405f4291d522176a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2856530
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Ivan Brovkovich <ivanbrovkovich@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
5 files changed