Do not avoid APs with wpa_ie or rsn_ie if !ieee->wpa_enabled
There are broken APs out there that fill these elements even
though encryption is disnabled. Also, this breaks legit WEP to
WPA migration scenarious.

We add a checking to prohibite WPA configured STA trying to
associate with non-WPA supported APs.

Signed-off-by: Stefan Rompf <stefan@loplof.de>
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>