Capture the current state of gate connectivity from the mesh
formation field in mesh config whenever we receive a beacon,
and report that via GET_STATION.  This allows applications
doing mesh peering in userspace to make peering decisions
based on peers' current upstream connectivity.
Signed-off-by: NBob Copeland <bobcopeland@fb.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>