send-pull-request: send all patches as the local user
When using sendmail to send patches, patches would appear to be from the
original author as git adds a From: header in the generated patches. This patch
changes this behavior to match that of git-send-email, where the email From:
header is that of the current sender (according to sendmail) and a "From:
Original Author <email>" line is inserted into the body of the message.
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
