Added new protocol hook for dumping of protocol-dependent route

attributes.

Please implement in all protocols.

TODO

@@ -2,6 +2,8 @@ Core
 ~~~~
 - Remove TOS support?
 
+* protocols: implement dumping of protocol-dependent rte attributes
+
 - config: executable config files
 
 - do we really need preconfig?

nest/protocol.h

@@ -38,6 +38,7 @@ struct protocol {
   struct proto * (*init)(struct proto_config *);		/* Create new instance */
   int (*reconfigure)(struct proto *, struct proto_config *);	/* Try to reconfigure instance */
   void (*dump)(struct proto *);			/* Debugging dump */
+  void (*dump_attrs)(struct rte *);		/* Dump protocol-dependent attributes */
   int (*start)(struct proto *);			/* Start the instance */
   int (*shutdown)(struct proto *);		/* Stop the instance */
 };