CHeckstyle and JUnit for base package in ONAP-REST

Added unit tests and fixed checkstyle and SONAR issues in the base
package of ONAPE-REST

There was a lot of knock-on automatic changes done by Eclipse when I
renamed the class XACMLRestProperties to XacmlRestProperties so ignore
the changes in all but the ONAP-REST package. I also didn't update the
licenses on files on those classes because the changes were automatic.

Issue-ID: POLICY-2131
Change-Id: I28823c844b5192f8d56de76a727996b13e7ea4a6
Signed-off-by: liamfallon <liam.fallon@est.tech>
41 files changed