[CI] Make sure the parent jobs are failed when the validation job fails

In CI the validation job [1] is called from the lab job [2]. When validation fails, the lab job should also fail, which is not the case now.

[1] https://jenkins.akraino.org/view/validation/job/bluval-daily-master/

[2] https://jenkins.akraino.org/view/validation/job/validation-enea-daily-master/