Update Watch to implement Closeable

Author: ukclivecox

util/src/main/java/io/kubernetes/client/util/Watch.java

@@ -31,7 +31,8 @@
  * set watch to True and watch the changes to namespaces.
  */
 public class Watch<T> implements Iterable<Watch.Response<T>>,
-        Iterator<Watch.Response<T>> {
+				 Iterator<Watch.Response<T>>,
+				 java.io.Closeable {
 
     /**
      * Response class holds a watch response that has a `type` that can be