blog: unregister a net dev (draft)

Signed-off-by: Junwei Zhang <junwei.zhang@6wind.com>
unregister net dev (draft)

Signed-off-by: Junwei Zhang <junwei.zhang@6wind.com>
blog: unregister-a-new-device

Signed-off-by: Junwei Zhang <junwei.zhang@6wind.com>