Suricata

While we have some fields covered in https://docs.suricata.io/en/latest/output/eve/eve-json-format.html#kerberos-fields,
many are still missing:

krb5.cname
krb5.encryption
krb5.error_code
krb5.failed_request
krb5.msg_type
krb5.ticket_encryption
krb5.ticket_weak_encryption
krb5.weak_encryption

This task also includes documenting the json schema for krb.