Try to start per-node servers immediately

I can't think of a good reason not to do this.
diff --git a/src/rexi_server_mon.erl b/src/rexi_server_mon.erl
index 205ef4a..2dcb41c 100644
--- a/src/rexi_server_mon.erl
+++ b/src/rexi_server_mon.erl
@@ -47,7 +47,7 @@
 
 init(ChildMod) ->
     net_kernel:monitor_nodes(true),
-    erlang:send_after(?INTERVAL, self(), check_nodes),
+    erlang:send(self(), check_nodes),
     {ok, ChildMod}.