* Helps resolve XML configs for versions before 1.11 when these new config options were introduced.
    * See https://wiki.jenkins-ci.org/display/JENKINS/Hint+on+retaining+backward+compatibility
    * @return resolved object
     */
   protected Object readResolve() {
      if (unstableSkips == null) {
         unstableSkips = unstableOnSkippedTests ? 0 : 100;
      }
      if (failedFails == null) {
         failedFails = 100;
      }
      if (failedSkips == null) {
         failedSkips = 100;
      }
      if (thresholdMode == null) {
         thresholdMode = 2;
      }
      return this;
   }