[RFC] Prepend "tags/" when describing tags with embedded name

On Fri, Dec 15, 2017 at 8:25 PM, Junio C Hamano [off-list ref] wrote:

I think the code makes sense, but it won't be understandable by
those who do not know what you discussed in the original thread.

A proper commit log message, with a new test or two in t6120, would
be an appropriate way to fix that.

Care to follow through, along the lines in
Documentation/SubmittingPatches?

The updated branch including tests can be found at:
http://repo.or.cz/git/dkf.git/shortlog/refs/heads/bugfix/describe-all

One existing test in t6210 needed updating to match the new behavior,
three new tests have been added: annotated tags, lightweight tags, and
branches.

Daniel

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