Your wpa_supplicant.conf file is missing a network block. At home my family uses a basic WPA2-PSK with an SSID, so my network blocked was created by using the wpa_passphrase command. Then it generates a network block for you which you can append to your /etc/wpa_supplicant.conf file:
wpa_passphrase "Home AP" "SuperSecretPassword" >> /etc/wpa_supplicant.conf
Here is the relevant information in my /etc/rc.d/rc.inet1.conf file:
# Config information for wlan0:
Also, don't be afraid to add more to the rc.inet1.conf file or the wpa_supplicant.conf file for more than one location. access point.
Shows many other types of setups too beyond that of just a WEP/WPA/WPA2-PSK in case you run into those situations.