fix refernce to project version

Jenkins uses dollar bracket to reference properties.

Change-Id: I5126576ae370c264e738aabfdbd17ec4fa817dd3
Reviewed-on: https://review.openstack.org/33728
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins