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This adds new policy that allows admin to restrict duplex mode
to either one-sided only or two-sided only.

Bug: 853877, 885265
Change-Id: I3698ca4d248415693590b895d0f3c28ad95755c2
Reviewed-on: https://chromium-review.googlesource.com/1224310
Commit-Queue: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595073}