PNF Tosca Ingestion into SO Catalog

Support the PNF Model ingestion using the getEnitity API from the SDC Parser library. 

This is the query:

EntityQuery entityQuery = EntityQuery.newBuilder(SdcTypes.PNF)
        .build();
TopologyTemplateQuery topologyTemplateQuery = TopologyTemplateQuery.newBuilder(SdcTypes.SERVICE)
        .build();

List<IEntityDetails> pnfs = sdcCsarHelper.getEntity(entityQuery, topologyTemplateQuery, false);

//you should check that the list is not empty first

Map<String, RequirementAssignment> reqs = pnfs.get(0).getRequirements();
Map<String, String> meta = pnfs.get(0).getMetadata().getAllProperties();