Updated openstack/openstack
Project: openstack-dev/devstack  2e2b09264f7d87cfe743994f0a705fa7731b34b3
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Add EPEL-7 repo for RHEL7

* RHEL7 requires epel for many dependencies.
* The default RDO URL also switched to an icehouse version.
* RHEL6 RDO repo also will be configured for RHEL7, but the
  configuration variable name remains RHEL6_RDO_REPO_RPM for compatibility
  reasons.

Change-Id: I414c0f5357bf24c8d5657ea8231515461862e734