plugin: Configure plugins once we've collected all cli options

lightningd/plugin.c

@@ -411,6 +411,10 @@ void plugins_init(struct plugins *plugins)
 		io_loop(NULL, NULL);
 }
 
+void plugins_config(struct plugins *plugins)
+{
+}
+
 void json_add_opt_plugins(struct json_stream *response,
 			  const struct plugins *plugins)
 {

lightningd/plugin.h

@@ -37,6 +37,15 @@ void plugins_init(struct plugins *plugins);
  */
 void plugin_register(struct plugins *plugins, const char* path TAKES);
 
+/**
+ * Send the configure message to all plugins.
+ *
+ * Once we've collected all the command line arguments we can go ahead
+ * and send them over to the plugin. This finalizes the initialization
+ * of the plugins and signals that lightningd is now ready to process
+ * incoming JSON-RPC calls and messages.
+ */
+void plugins_config(struct plugins *plugins);
 /**
  * Add the plugin option and their respective options to listconfigs.
  *