Remove defaultgraph from config.properties.
remove VIRTUOSO_DEFAULT_GRAPH from ConfigProperty.
Update LocalRDFRepo constructor using namedGraph.
Update createLocalRDFRepo method in RDFDataUnitFactory.
Remove unused imports from VirtuosoRDFRepo.
Update using virtuosoRepository with set graph in constructor - close #364 issue.
Update using VirtuosoRDFRepo in tests.