Show which user account each change was uploaded under

This way users are well aware of which account we used when the
uploads are complete, so they can be certain to sign into the web
application with that user identity.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/subcmds/upload.py b/subcmds/upload.py
index ad05050..9018455 100644
--- a/subcmds/upload.py
+++ b/subcmds/upload.py
@@ -158,6 +158,7 @@
                  branch.project.relpath + '/',
                  branch.name)
           print >>sys.stderr, '%s' % branch.tip_url
+          print >>sys.stderr, '(as %s)' % branch.owner_email
           print >>sys.stderr, ''
 
     if have_errors: