Update to packaging script for VS 2017
Update to packaging script for VS 2017

VS 2017 has been released and needs to be packaged so that we can
experiment with building with it. This is an initial pass at updating
the packaging script. The file layout has changed significantly in VS
2017. Compatibility with VS 2013 and VS 2015 has, I believe, been
maintained but it is not important enough to merit significant testing.

BUG=683729

Change-Id: I68e5a8d9fd389132b641743dbc070108497f54cb
Reviewed-on: https://chromium-review.googlesource.com/457153
Commit-Queue: Bruce Dawson <fe9e26f3989304bf7275ed139c57fd059c63d22d@chromium.org>
Reviewed-by: Scott Graham <e134406e1863f3b48b0795831afac5c0595efb36@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools