spotbugs only seems to report txt now

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1896145 13f79535-47bb-0310-9956-ffa450edef68

jenkins/create_jobs.groovy

@@ -464,7 +464,7 @@ poijobs.each { poijob ->
                 recordIssues {
                     tools {
                         spotBugs {
-                            pattern('*/build/reports/spotbugs/*.xml')
+                            pattern('*/build/reports/spotbugs/*.txt')
                             reportEncoding('UTF-8')
                         }
                     }