flow init --options temp_dir=foo
flow init --options temp_dir=foo

Summary:At some point we need to revamp this code so that every option
is automatically supported. In the meantime, adding another option that
I need.

Reviewed By: mroch

Differential Revision: D3083476

fb-gh-sync-id: 3c231634d11e7e44ef608057296fa378a31a21ce
shipit-source-id: 3c231634d11e7e44ef608057296fa378a31a21ce

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