- Upgraded authzforce-ce-core-pdp-api version to 16.1.0 adding
PolicyProvider#getCandidateRootPolicy() interface
- Changed PDP config XSD
	- Simplified versioning (version="7.1" and remove minor version from
namespace)
	- 'rootPolicyRef' no longer mandatory. If not specified,
PolicyProvider#getCandidateRootPolicy() on the 'policyProvider' is used
to specify the root policy
- Added CoreStaticPolicyProvider#getCandidateRootPolicy() to implement
PolicyProvider#getCandidateRootPolicy()