[test] Fix failing test compilation

Author: chris-evolvedbinary

exist-core/src/main/java/org/exist/util/Configuration.java

@@ -74,8 +74,15 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Hashtable;
+import java.util.List;
+import java.util.Locale;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Optional;
+import java.util.Properties;
 import java.util.stream.Collectors;
 
 import javax.annotation.Nullable;