Enable EPEL mirror by default
Enable EPEL mirror by default

We recently disabled EPEL in openstack-infra, enable it again.

Change-Id: I213b302b34b740354d63b69e8ac7f4e1b3d3cdd7
Signed-off-by: Paul Belanger <e7139c8e6c4ea75cc1c287ce081b2dc0f3ab39ec@redhat.com>

group-policy/devstack,dtroyer/devstack,nawawi/openstack,dtroyer/devstack,noironetworks/devstack,openstack-dev/devstack,noironetworks/devstack,nawawi/openstack,openstack-dev/devstack,group-policy/devstack,richliu/devstack,richliu/devstack