JBPM-4259 - Remove logic from TaskDataImpl object  (cherry-picked from master)
Test class fix (ComparePair for JAXB roundtrip comparisions) (cherry-picked from 6.0.x)
BZ-1058604 - Implement REST operation for cleaning all data .. (cherry-pick from master)
- updating classes to work with latest changes in audit
- task audit refactoring: updating queries