DO_NOT_SUBMIT: Add more detail for junit merge error

Author: pwschuurman

Diff for: test/k8s-integration/filter-junit.go

@@ -91,6 +91,8 @@ func MergeJUnit(testFilter string, sourceDirectories []string, destination strin
 			if err != nil {
 				return err
 			}
+			klog.Warningf("Attempting to unmarshal file: %v", fullFilename)
+			klog.Warningf("Attempting to unmarshal file: %v. Contents: %s", fullFilename, data)
 			if err = xml.Unmarshal(data, &junit); err != nil {
 				return err
 			}