Update the CIPD recipe module to generate platform suffixes for
arbitrary OS, architecture, and bitness.

BUG=None
TEST=expectations

Change-Id: Ic713adc403dc135895a1cfaaa6ba1546742125d9
Reviewed-on: https://chromium-review.googlesource.com/573412
Commit-Queue: Daniel Jacques <dnj@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>