Fixes for pytz and httplib automagic importing.
Fixes for pytz and httplib automagic importing.

R=iannucci@chromium.org, pgervais@chromium.org
BUG=389652

Committed: https://chromium.googlesource.com/infra/infra/+/8f15951

Review URL: https://codereview.chromium.org/360033006

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra