Bug: contributor search does not work properly for github messages

Start at https://lists.apache.org/list.html?dev@ponymail.apache.org

Click on justinmclean

The display will show all messages from git@git.apache.org, not just ones from justinmclean.

I realise that the git@git.apache.org address has multiple names associated with it.

Since the Contributor stats can (and does) distinguish such e-mails, clicking the associated search link should do the same.

Open the Pony Mail list page at the reported URL and reproduce the search by clicking justinmclean. Compare the resulting messages with the contributor statistics search link, and consider the issue complete when the search returns only messages associated with justinmclean rather than every message from git@git.apache.org.

Written by the indexing model from the issue text.