iplink_bond_slave: show mii_status only once

With "ip -d link show", bonding slave mii status is displayed
twice, once as a number and once as a name.

Fixes: 730d3f61 ("iplink: add support for bonding slave")
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
iproute2: add man page for mqprio

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>