populate: keep URLs, refs, and names from being taken for options

A git source's url and ref are strings, and git clone, git remote, and
git fetch took ones starting with - for options, e.g. --upload-pack,
which runs a command where the repository is local.  They come after
-- now, and so does a pass source's name for git log and pass show.

git-ref-option gives a ref that git fetch would take for
--upload-pack.

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