Argument type mismatch in RHQ for Amend XSite operations

All 3 amend operations for XSite are not callable properly because of argument type mismatch exception.
We need to specify type property for particular attributes in rhq-plugin.xml. It means we need to change Parameter class in jmx annotation slightly as well as description of XSite operations in XSiteAdminOperations class.

Basically we need to add type="integer" or type="long" respectively for some fields.