Remove duplicate code on ManagerBase and DeltaManager.
Introduce following interfaces.
  Manager#changeSessionId(Session, String)
  Session#tellChangedSessionId(String, String, boolean, boolean)

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446072 13f79535-47bb-0310-9956-ffa450edef68