Both holders' uplink-tools copies read address, master, link and
link_index/link_netnsid from the existing ip -j address show call. Fields
are left out where a link has none (L3); a parent in another namespace is
{index, namespace} (L2); the form lives in uplink.go only (L4); only the
tool description changes, not seat.json (L5); bridge fdb MACs are not
answered (L6); names mac, master, parent (L1).
Builds: design 48 10, design 08 code:, issue 1965 note 11 L1-L6
jschoubben