Currently the driver allows roaming to the BSSID
which it is already connected, which can lead to
many unexpected behaviour, for eg. if the SAP
to which the DUT is connected turns off, then the
DUT would try to roam to other BSSID of the same
SSID, and in case the SAP turns on back in time,
then the DUT would re-associate to the same BSSID.
Now if the subnet may change, and since the DHCP
does not happen again in roaming, it would then
lead to NUD failure.
Fix is to introduce an ini to allow/disallow
roaming to the same BSSID.
Change-Id: Ibd04fcd7384c0987db5bb6dae1a26ee077456290
CRs-Fixed: 2634860
954abc7aa9