OAK-11571: commons: add Closer class (similar to Guava Closer) - move…

… test class

oak-commons/src/test/java/org/apache/jackrabbit/oak/commons/io/CloserTest.java → oak-commons/src/test/java/org/apache/jackrabbit/oak/commons/pio/CloserTest.java

@@ -16,9 +16,8 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-package org.apache.jackrabbit.oak.commons.io;
+package org.apache.jackrabbit.oak.commons.pio;
 
-import org.apache.jackrabbit.oak.commons.pio.Closer;
 import org.junit.Test;
 
 import java.io.Closeable;