Set one test-file to "IGNORED" in poi-integration

It was processing fine on some JVM versions, but failed with an error on others.
Seems there is a difference in XmlParsers across versions of the JVM.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1912404 13f79535-47bb-0310-9956-ffa450edef68