Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55973
Fix processing of XML schemas when validation is enabled in Jasper.

The code is based on a similar fragment in Digester#getFactory().

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1556377 13f79535-47bb-0310-9956-ffa450edef68