Add possibility to enable/disable jmx statistics on cache level using RHQ

Monitoring of cache statistics (InVM plugin for RHQ) works pretty well now. However, when we create a brand new cache (using mgmt operation an a cache manager) – this new cache is configured with DISABLED jmx stats by default.

It would be awesome to add operation which can dynamically enable and disable JMX statistics per request (e.g. issue another JMX operation on a cache level.)

Please, comment whether is this even possible and we will be not violating any restriction. WDYT? Thanks!