Started with test decision JSON objects.

Added new Policy Finder Factory that ONAP will use and
got the code working with new policy/models (see other
review which will have to be merged first).

Added some new conversion methods to convert from a
Xacml request to an Onap request.

Added some property methods for XACML Properties objects
and JUnit tests.

Started filling in some Guard application details and
combining code.

Issue-ID: POLICY-1602
Change-Id: I5235b74f3b036dcf05779b655a03ac290d594354
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>