Tests failed because of infra error after running check-patch.sh

[Nir Soffer]

Hi infra,

This failure is not a valid reason to mark the patch with -1.

00:15:09.614 ERROR:  Failed to umount
/var/lib/mock/epel-6-x86_64-d496d3daa673001f46dbbd9addf9ba1b/root/home/jenkins/workspace/ovirt-engine_3.6_check-patch-el6-x86_64/ovirt-engine.
00:15:09.614 + failed=true

See http://jenkins.ovirt.org/job/vdsm_master_check-patch-fc23-x86_64/363/consoleFull

Basically, any failure before or after running check-patch.sh is an
infra error and should
appear on gerrit as an infra error (no vote).

Can someone take a look?

Nir