Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54380
- In MapperListener.lifecycleEvent():
call registerWrapper(), registerContext() only if the parent component has already been started.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1430147 13f79535-47bb-0310-9956-ffa450edef68