Remove unused service_* from authtoken middleware

service_port and service_host are not used by the current keystone authtoken
Change-Id: Iff5d2dccdc69b0a05443500d45b144acfbbe3c79
diff --git a/AUTHORS b/AUTHORS
index bca25b4..9d838e8 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -17,6 +17,7 @@
 Jason Cannavale <jason.cannavale@rackspace.com>
 Jay Pipes <jaypipes@gmail.com>
 Jesse Andrews <anotherjesse@gmail.com>
+Joe Gordon <jogo@cloudscaling.com>
 Johannes Erdfelt <johannes.erdfelt@rackspace.com>
 Josh Kearney <josh@jk0.org>
 Justin Shepherd <galstrom21@gmail.com>