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The main thing here is to move get_parts into the parts.py.

Bug: 926234
Change-Id: Icf7d9129281ef45438d1dfa27c992c011d0306bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016972
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737374}