Review request for JMC-6158: Adding JfrAttribute for event type id

[Marcus Hirt]

Hi all,

Please review this fix to provide a JfrAttribute for event type id.

Jira:   https://bugs.openjdk.java.net/browse/JMC-6158
Webrev: http://cr.openjdk.java.net/~hirt/JMC-6158/webrev.01/

Kind regards,
Marcus