Merge branch '15-increase-coverage-in-tmf634' into 'develop'

.gitignore

src/main/java/org/etsi/osl/tmf/JsonUtils.java

src/main/java/org/etsi/osl/tmf/rcm634/api/ApiException.java

...st/java/org/etsi/osl/services/api/rcm634/CommonTests.java

...vices/api/rcm634/ConnectionPointSpecificationRefTest.java

.../osl/services/api/rcm634/ConnectionSpecificationTest.java

...a/org/etsi/osl/services/api/rcm634/ConstraintRefTest.java

...osl/services/api/rcm634/EndpointSpecificationRefTest.java

.../java/org/etsi/osl/services/api/rcm634/EntityRefTest.java

...test/java/org/etsi/osl/services/api/rcm634/ErrorTest.java

...i/osl/services/api/rcm634/EventSubscriptionInputTest.java

...g/etsi/osl/services/api/rcm634/EventSubscriptionTest.java

.../services/api/rcm634/ExportJobCreateEventPayloadTest.java

...tsi/osl/services/api/rcm634/ExportJobCreateEventTest.java

...org/etsi/osl/services/api/rcm634/ExportJobCreateTest.java

...sl/services/api/rcm634/ExportJobStateChangeEventTest.java

.../java/org/etsi/osl/services/api/rcm634/ExportJobTest.java

...es/api/rcm634/ResourceSpecificationApiControllerTest.java

...s/api/rcm634/ResourceSpecificationCharacteristicTest.java

...si/osl/services/api/rcm634/ResourceSpecificationTest.java