Wireless NICs not obeying 'SSID' setting.

I've noticed that in a recent patch that when you set a NIC with ifconfig
ath0 ssid "This One" that it won't always honor that and jump on the
strongest one.

Example:

3 WAPs: SSIDs WAP1, WAP2, WAP3

I have set ath0's ssid to "WAP2" and ral0's ssid to "WAP3". They both will
honor the ssid setting for the first connection. However, after a few
hours/etc the drivers both associate with WAP1.

The settings to require the specific SSID are in
/etc/start_if.ral0/start_if.ath0. There aren't any conflicting directives to
force it to go blank and select a random AP.