Followup to r1562597
Align return value in stub class with the default one in StandardContext

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1564742 13f79535-47bb-0310-9956-ffa450edef68
Followup to r1562597
xmlBlockExternal is now true by default. It is the false value that now needs to be passed explicitly.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1564746 13f79535-47bb-0310-9956-ffa450edef68