Also fixes git cl description <url> by propagating codereview host information
in all cases.

BUG=681704
R=agable@chromium.org

Change-Id: Ia79c10b19d72b5a8797a1428ad8a79c8f4480901
Reviewed-on: https://chromium-review.googlesource.com/431036Reviewed-by: Aaron Gable <agable@chromium.org>