Re: [infra-tests] Improve the robustness of get_branch_point (#5411)

<img class="emoji" title=":lgtm:" alt=":lgtm:" align="absmiddle" src="https://reviewable.io/lgtm.png" height="20" width="61"/> The code makes sense to me, and I can confirm it resolves the `--unshallow` issue I was experiencing locally. I'd still like @jugglinmike to take a look, but I'm ok if Travis is.

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Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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*Comments from [Reviewable](https://reviewable.io:443/reviews/w3c/web-platform-tests/5411#-:-Kh3PpZxemMqZvxAfqIM:b1xv512)*
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View on GitHub: https://github.com/w3c/web-platform-tests/pull/5411#issuecomment-292257506

Received on Thursday, 6 April 2017 18:01:27 UTC