Review request for JMC-6408: Cleanup of MBeanOperationsWrapper

[Marcus Hirt]

Hi all,

Please review this fix to clean up the MBeanOperationsWrapper a bit 
(should not subclass ArrayList).

Jira:   https://bugs.openjdk.java.net/browse/JMC-6408
Webrev: http://cr.openjdk.java.net/~hirt/JMC-6408/webrev.0/

Kind regards,
Marcus