fix request log NS

Author: SimonBin

components-core/src/main/java/org/dllearner/kb/sparql/ClassBasedSampleGenerator.java

@@ -38,7 +38,6 @@
 import org.dllearner.reasoning.ReasonerImplementation;
 import org.dllearner.utilities.examples.AutomaticNegativeExampleFinderSPARQL2;
 import org.mindswap.pellet.PelletOptions;
-import org.openrdf.model.vocabulary.RDF;
 import org.semanticweb.owlapi.apibinding.OWLManager;
 import org.semanticweb.owlapi.model.*;