p2p: always recreate a new peer id on startup

This prevents easy fingerprinting when you change IPs, and
will be a must when kovri gets used.

src/rpc/core_rpc_server.h

@@ -194,3 +194,5 @@ private:
     bool m_restricted;
   };
 }
+
+BOOST_CLASS_VERSION(nodetool::node_server<cryptonote::t_cryptonote_protocol_handler<cryptonote::core> >, 1);