The sta2.scan() calls were performing full scan of all channels and
reporting only the BSS entry that happened to be the first one in the
wpa_supplicant list. This is problematic since it is possible that the
target AP was not found and incorrect BSS was selected and used for
setting scan_freq which made the connection fail. Furthermore, there is
no need to use full scan for these test cases, so use a single channel
scan instead.
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>