story 74774960. Create PDPFactory Unit Test.

Added PFPFactoryTest.

https://www.pivotaltracker.com/s/projects/684825/stories/74774960
Merge pull request #21 from umd-lib/pdpfactory-unit

story 74774960. Create PDPFactory Unit Test.
Create XACMLAuthorizationDelegate Unit Test

- Implemented test cases for XACMLAuthorizationDelegate public methods.

Resolves: https://www.pivotaltracker.com/s/projects/684825/stories/74774874.