Format:
domain, receive_time, serial,
seqno, actionflags, type, subtype, config_ver, time_generated, vsys,
eventid, stage, auth_method, tunnel_type, srcuser, srcregion, machinename,
public_ip, public_ipv6, private_ip, private_ipv6, hostid, serialnumber,
client_ver, client_os, client_os_ver, repeatcnt, reason, error,
opaque, status, location, login_duration, connect_method, error_code,
portal