Tweak message; only log it on a relay.

src/core/or/policies.c

@@ -1165,13 +1165,14 @@ validate_addr_policies(const or_options_t *options, char **msg)
 
   static int warned_about_nonexit = 0;
 
-  if (!warned_about_nonexit && options->ExitPolicy == NULL &&
+  if (public_server_mode(options) &&
+      !warned_about_nonexit && options->ExitPolicy == NULL &&
       options->ExitRelay == -1 && options->ReducedExitPolicy == 0) {
     warned_about_nonexit = 1;
     log_notice(LD_CONFIG, "By default, Tor does not run as an exit relay. "
-               "The reason is to prevent your relay from appearing as the "
-               "source of abusive traffic. If you want to be an exit relay, "
-               "set ExitRelay to 1.");
+               "If you want to be an exit relay, "
+               "set ExitRelay to 1. To suppress this message in the future, "
+               "set ExitRelay to 0.");
   }
 
   /* The rest of these calls *append* to addr_policy. So don't actually