Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57267
Add the following for the manager's save command:
- basic description in Manager Javadoc
- document the StoreConfigLifecycleListener
- add the /save command to the Manager How-To

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc8.0.x/trunk@1645533 13f79535-47bb-0310-9956-ffa450edef68