https://issues.apache.org/bugzilla/show_bug.cgi?id=55282
Fix message that is displayed when a duplicate listener is added.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1600616 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56588
Update according to the changes in Tomcat 8:
Un-deprecate Context.addApplicationListener(String)
Deprecate Context.addApplicationListener(ApplicationListener)

Replace calls to addApplicationListener(new ApplicationListener(x, false)) with addApplicationListener(x).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1600638 13f79535-47bb-0310-9956-ffa450edef68