DNS request information

Events pertaining to requests from DNS servers or L7 network devices.

These events belong to the dns metaclass.

The domain field is used in intel matching.

Taxonomy	Type	Description
`domain`	string	Domain name. Typically seen in an `HTTP`, `DNS`, or authentication request.
`protocol`	string	Protocol used in a session (such as `http`, `ftp`, `smtp`)
`querytype`	integer	DNS record/query type (such as `1`, `2`, `6`, `12`, `28`)
`querytypename`	string	DNS/record query type (such as `A`, `NS`, `SOA`, `PTR`, `AAAA`)