Drops unused code

(cherry picked from commit 412684b)

core/src/main/java/org/apache/struts2/interceptor/ExecuteAndWaitInterceptor.java

@@ -196,12 +196,6 @@ public class ExecuteAndWaitInterceptor extends MethodFilterInterceptor {
         this.container = container;
     }
 
-    /* (non-Javadoc)
-    * @see com.opensymphony.xwork2.interceptor.Interceptor#init()
-    */
-    public void init() {
-    }
-
     /**
      * Creates a new background process
      *
@@ -306,13 +300,6 @@ public class ExecuteAndWaitInterceptor extends MethodFilterInterceptor {
         }
     }
 
-
-    /* (non-Javadoc)
-     * @see com.opensymphony.xwork2.interceptor.Interceptor#destroy()
-     */
-    public void destroy() {
-    }
-
     /**
      * <p>
      * Performs the initial delay.