cipd: Print zip extraction progress.
cipd: Print zip extraction progress.

Otherwise cipd client is too silent when extracting large (~1GB) packages.

R=nodir@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2114053003

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go