8221098: Run java/net/URL/HandlerLoop.java in othervm mode

Reviewed-by: alanb, martin
diff --git a/test/jdk/java/net/URL/HandlerLoop.java b/test/jdk/java/net/URL/HandlerLoop.java
index 3249e24..26adcf0 100644
--- 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 {