Updated openstack/openstack
Project: openstack/heat  48889967ee0e5b929afdf2813094f4c1ba476b40
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Check that the epel repo exists before adding it

The epel repo that contains cloud-init and other packages needed for the
rackspace resource does not always exists. The setup script will fail if
you try to import the repo when it exists because of running the script
with set -e.

Change-Id: If1f912c2e7cbe3ccd58e10d0ea2e1e07b2114b48