RFR: vcs: handle lightweight tags in Git

[Robin Westberg]

On Wed, 17 Jun 2020 10:13:10 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that makes `GitRepository.annotate` handle lightweight tags gracefully.
> 
> Testing:
> - [x] Added a unit test
> - [x] `make test` passes on Linux x64
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/670