Fetch the age of the association for STAs in order to implement minimum
intervals after which a STA is considered kickable.
Signed-off-by: David Bauer <mail@david-bauer.net>
Add the node BSSID to the usteer_node struct. This will be helpful in
the future when evaluating beacon reports from STAs.
Signed-off-by: David Bauer <mail@david-bauer.net>