ISPN-2741 Conditional operation test should be set to sync commit true
ISPN-2759 Don't throw an NPE when invoking operations via the RHQ plugin
ISPN-2756 Enabling/disabling RpcManager statistics via JMX doesn't work

Remove some duplicate @ManagedAttribute annotations for the same JMX
attribute and change ResourceDMBean to fail when it finds such duplicates.