stabilize intermittent test failures

workaround issues when AS process became stale and FD kicks in only after 30 seconds

&#27;[0m&#27;[31m14:21:55,839 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/stateful].[org.jboss.as.test.clustering.ViewChangeListenerServlet]] (http-/127.0.0.1:8180-1) JBWEB000236: Servlet.service() for servlet org.jboss.as.test.clustering.ViewChangeListenerServlet threw exception: java.lang.InterruptedException: Cluster 'ejb' failed to establish view [node-1/ejb] within 15000 ms.  Current view is: [node-0/ejb, node-1/ejb]