Without the patch, 'ifconfig hn0' doesn't have these 2 lines:
media: Ethernet autoselect <full-duplex> status: active
(If we 'ifconfig down hn0', the second line will be "status: no carrier".)
We got the complaint from a customer, because the customer's
application doesn't expect the support is unavailable.
Signed-off-by: Dexuan Cui <email@example.com>