This patch adds support to retrieve the new bond slave attributes:
IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE
IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE
which are read-only.

(Removed if_link.h changes already updated in net-next)
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>