Specifies the security mode.
if wep, table ruckusWLANWEPTable should be configured firstly;
if wpa + 'psk' auth,table ruckusWLANWPATable should be configured firstly;
if wpa + 'eap-802-1x' or 'auto' auth,firstly configure ruckusWLANAAAServerTable,then configure ruckusWLANWPATable.