ISPN-2611 + ISPN-2745 Drop rhq-pluginAnnotations and rhq-pluginGen / Add missing ops

ISPN-2611 Drop rhq-pluginAnnotations and rhq-pluginGen
- just use the existing Infinispan JMX annotations augmented with a few extra attributes
- use a simple XSL transform to generate the rhq-plugin.xml descriptor
ISPN-2745 Add missing operations and parameter names/descriptions
- RecoveryAdmin operations were not included by the RHQ plugin
- Force the use of the @Parameter annotations to describe operation parameters