Clovis: Improve --local_binary option.
Clovis: Improve --local_binary option.

Make --local_binary smart enough to be relative to code directory no matter where a script is being run from.

Review URL: https://codereview.chromium.org/1825333002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#382823}

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