Merge job is successful, but report errors, as a result samples-impl are not uploaded to nexus:

https://jenkins.fd.io/job/hc2vpp-merge-1701-ubuntu1604/34/

Verify job is successful:

https://jenkins.fd.io/job/hc2vpp-verify-1701-ubuntu1404/68/

Also investigate why jobs were successful and make them fail on such errors.