help security
=============
wpa_type : 0 for WEP, 1 for WPA, 2 for WPA2
wpa_algorithms:
    CCMP = AES in Counter mode with CBC-MAC [RFC 3610, IEEE 802.11i]
    TKIP = Temporal Key Integrity Protocol [IEEE 802.11i]
wpa_sharedkey:
    secret in hex format (64 hex digits), wpa_psk, or as an ASCII passphrase

usage: set security.[key] [value]