devserver: Deprecate fileinfo API

This is not used by AU tests anymore.

BUG=chromium:1054529
TEST=devserver_integration_test.py

Change-Id: If6e689e32eab1337d89bbdf92b5ae16d8c42e6c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2095982
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Commit-Queue: Keith Haddow <haddowk@chromium.org>
2 files changed