OAK-11408: Extract IteratorUtils from CollectionUtils - address Sonar warnings

Author: reschke

oak-commons/src/main/java/org/apache/jackrabbit/oak/commons/collections/IteratorUtils.java

@@ -22,7 +22,6 @@
 
 import java.util.Iterator;
 import java.util.Objects;
-import java.util.stream.Stream;
 
 /**
  * Utility methods for {@link Iterator} conversions.

oak-commons/src/test/java/org/apache/jackrabbit/oak/commons/collections/IteratorUtilsTest.java

@@ -29,7 +29,7 @@
 public class IteratorUtilsTest {
 
     @Test
-    public void iteratorToIIteratable() {
+    public void iteratorToIIterable() {
         Iterator<String> iterator = List.of("a", "b", "c").iterator();
         iterator.next();
         Iterable<String> iterable = IteratorUtils.toIterable(iterator);
@@ -38,7 +38,7 @@ public void iteratorToIIteratable() {
         Assert.assertEquals("c", testit.next());
         Assert.assertFalse(testit.hasNext());
         try {
-            testit = iterable.iterator();
+            iterable.iterator();
             fail("should only work once");
         } catch (IllegalStateException expected) {
             // that's what we want