If a commit with a footer of another user is pushed, the other user is
automatically added as CC. This makes no sense if the other user
cannot see the change. Adding the other user as CC in this case is not
harmful, since no email notification is sent, but it's confusing for
users that can see the change, because they wonder if the other user
was notified.
Change-Id: I8ec3c7d48c9152474431b24beb8984fbae8e47e7
Signed-off-by: Edwin Kempin <ekempin@google.com>