463022: [api] add support for storing usernames on RepositoryPerson 

Change-Id: Id565b10626461759e0322bcbbbd37e628e27eafb
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=463022
Signed-off-by: chris.poon <chris.poon@tasktop.com>
8 files changed