cleans imports and other warnings

tests/com.minres.scviewer.database.test/src/com/minres/scviewer/database/test/DatabaseServicesTest.java

@@ -15,11 +15,7 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
-import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import org.junit.After;
 import org.junit.Before;