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>

subcmds/upload.py

@@ -158,6 +158,7 @@ changes in all projects listed in the manifest.
                  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: