updated xunit reporter to conform to the junit xsd (https://svn.jenkins-ci.org/trunk/hudson/dtkit/dtkit-format/dtkit-junit-model/src/main/resources/com/thalesgroup/dtkit/junit/model/xsd/junit-5.xsd)
Merge pull request #876 from fredr/master

updated the xunit report to conform to junit 5 xsd