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"HOME" doesn't always exist as a envvar
https://stackoverflow.com/questions/4028904/how-to-get-the-home-directory-in-python

Bug: 869249
TBR: jbudorick
Change-Id: I13f381d12ac75f3ec45b9736b980b30e32e602af
Reviewed-on: https://chromium-review.googlesource.com/1157648Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580408}