examples/ethtool: display bus information

This patch enhances the ethtool example to support to show
bus information, in the same way that the Linux kernel
ethtool does.

Signed-off-by: Qiming Yang <qiming.yang@intel.com>
Acked-by: Remy Horton <remy.horton@intel.com>

examples/ethtool/ethtool-app/ethapp.c

@@ -186,6 +186,7 @@ pcmd_drvinfo_callback(__rte_unused void *ptr_params,
 			id_port, info.driver, info.version
 		      );
 		printf("firmware-version: %s\n", info.fw_version);
+		printf("bus-info: %s\n", info.bus_info);
 	}
 }