RFR [13] 8221098: Run java/net/URL/HandlerLoop.java in othervm mode

[Chris Hegarty]

HandlerLoop should be run in othervm, as it sets the system-wide URL
protocol handler factory which could inadvertently affect subsequent
tests run in the same agentvm. An example of this is in the bug
description: https://bugs.openjdk.java.net/browse/JDK-8221098

$ hg diff test/jdk/java/net/URL/HandlerLoop.java
diff --git a/test/jdk/java/net/URL/HandlerLoop.java b/test/jdk/java/net/URL/HandlerLoop.java
--- a/test/jdk/java/net/URL/HandlerLoop.java
+++ b/test/jdk/java/net/URL/HandlerLoop.java
@@ -32,7 +32,7 @@
  * @summary Test bootstrap problem when a URLStreamHandlerFactory is loaded
  *          by the application class loader.
  * @modules java.base/sun.net.www.protocol.file
- * @run main HandlerLoop
+ * @run main/othervm HandlerLoop
  */
 public class HandlerLoop {

-Chris.