bandsteering:  Robustness to STAs which re-join the network.

Immediately reactivate bandsteering for STAs which successfully
associate with the target interface.  This fixes the case in which a
STA that is bandsteered, leaves the network, and then re-joins the
network is treated as a STA for which bandsteering failed.

Change-Id: I4e43c6392628b00b79dd09158a7f1bb151888ae9
4 files changed