Fixing copyartifact to work with latest version

Version 1.26 of the copy artifact plugin changed the xml from
projectName to project.  This change is making that same change.
I don't know if we, somehow, want to support the older version
of the copy artifact plugin.

Change-Id: I98b25649521d6d34380eea6597a4015d2d929ebc
Reviewed-on: https://review.openstack.org/29940
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins