Communication must now be enabled explicitly.

The communication subsystem is now disabled until a new BiF,
enable_communication(), is called. The base scripts do this
automatically when either a Communication::Node is defined, or Bro is
asked to listen for incoming connections.

scripts/base/frameworks/communication/main.bro

@@ -108,6 +108,9 @@ const src_names = {
 event bro_init()
 	{
 	Log::create_stream(COMMUNICATION, [$columns=Info]);
+
+	if ( |nodes| > 0 )
+		enable_communication();
 	}
 
 function do_script_log_common(level: count, src: count, msg: string)