Logging was missing from __init__.py which broke under mac. This adds
that back in and remove unused imports from other files. The os check
is also moved up to be the first thing we look for since is_google_host
does not work with mac at the moment.
Bug:326277821
Change-Id: I3f28838d367eb9583332fd33ad35d71c0851fe4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/6604498
Commit-Queue: Struan Shrimpton <sshrimp@google.com>
Reviewed-by: Ben Pastene <bpastene@chromium.org>