a couple gerrit things

[Marc Jones]

Hi Patrick,

Can the gerrit merge emails include the reviewers/commiter ID?

Gerrit (or the hook?) prevents pushing a new patch without the signoff
of the person pushing except when a patch is already signed off in
gerrit. If a patch is cherrypicked from gerrit and pushed again, it
doesn't need a new signoff. I think that anyone that pushes a change
should add a signoff. It might help prevent the unintentional push.

Marc