INTERLOK-4044 Remove ElContextClenader as this is deprecated and doesn't need replacement.

jetty/jetty.project#8712

Author: Sebastien Belin

interlok-common/src/main/resources/com/adaptris/core/management/webserver/jetty-webdefault-failsafe.xml

@@ -29,14 +29,6 @@
     This file is applied to a Web application before its own WEB_INF/web.xml file
   </description>
 
-  <!-- ==================================================================== -->
-  <!-- Removes static references to beans from javax.el.BeanELResolver to   -->
-  <!-- ensure webapp classloader can be released on undeploy                -->
-  <!-- ==================================================================== -->
-  <listener>
-   <listener-class>org.eclipse.jetty.servlet.listener.ELContextCleaner</listener-class>
-  </listener>
-
   <!-- ==================================================================== -->
   <!-- Removes static cache of Methods from java.beans.Introspector to      -->
   <!-- ensure webapp classloader can be released on undeploy                -->