Avoid silent failure on sourcing stackrc
Avoid silent failure on sourcing stackrc

Sourcing stackrc can fail ugly sometimes due
to hiera command inside.

Change-Id: Ibaaae0284ed1b42291948fea39e102483a5b0c35
Signed-off-by: Sorin Sbarnea <8938dff14221394d430a023580a32caf3bfb26a9@redhat.com>

okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared,okolisny/InfraRed