Log4jServletContextListener skips initialization and thusly never calls stop()

Log4jServletContextListener is not working in Tomcat 8 or 8.5 as it's never initialized.

The contextInitialized is never called and thus it never sets the servletContext.

This is checked when a servletContext is destroyed and ignored every time.

The outcome, is that our customer appenders are never stopped leading to resource leaks.