change relay URL: use more distinctive path prefix

This might make it easier for an application's web site to include a
relay, without competing with some other resource named "relay".

src/wormhole/public_relay.py

@@ -1,5 +1,5 @@
 
 # This is a relay I run on a personal server. If it gets too expensive to
 # run, I'll shut it down.
-RENDEZVOUS_RELAY = "http://wormhole-relay.petmail.org:3000/relay/"
+RENDEZVOUS_RELAY = "http://wormhole-relay.petmail.org:3000/wormhole-relay/"
 TRANSIT_RELAY = "tcp:wormhole-transit-relay.petmail.org:3001"

src/wormhole/servers/relay.py

@@ -324,7 +324,7 @@ class RelayServer(service.MultiService):
         self.relayport_service = strports.service(relayport, site)
         self.relayport_service.setServiceParent(self)
         self.relay = Relay() # accessible from tests
-        self.root.putChild("relay", self.relay)
+        self.root.putChild("wormhole-relay", self.relay)
         t = internet.TimerService(5*MINUTE, self.relay.prune_old_channels)
         t.setServiceParent(self)
         self.transit = Transit()