Fix the post-publishing job: correct src directory
Fix the post-publishing job: correct src directory

Use the (hopefully correct) directory where the artifacts are
really stored.
This should fix the newly merged sahara-extra-publish-artifacts
job, which dit not test proper testing (sorry).

Change-Id: I3d6f9fd7c39633c6b3ba24bab369f50ba50d8fbc

openstack/sahara-extra,openstack/sahara-extra,openstack/sahara-extra,openstack/sahara-extra