Inject BUNDLE_PATH into cookbook builds.

Fixes bug 1189692

Change-Id: I3e95c25317b82fb1b63f7f58eaf4a5809ae86329
Reviewed-on: https://review.openstack.org/32512
Reviewed-by: Jay Pipes <jaypipes@gmail.com>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins