If sendemail.from is configured to use a generic server account for
all envelopes, include the actual user's name and email in the body
of the message using a fake "From: " header that is similar to the
RFC header used in the envelope, and similar to how git format-patch
records an author in the body of the email.
Bug: issue 475
Change-Id: Id2bbf12ec174f0a660c5f8bf380291b81941ce3d
Signed-off-by: Shawn O. Pearce <sop@google.com>
6f2ccde49b