Remove dependency on EPEL
Remove dependency on EPEL

The EPEL repositories currently conflict with the RDO packages,
this commit drops it from openstack_hosts so new installs do not
get it.

Change-Id: I76def7ddd81d1e80c9f5bd4d2f083c10ee602687

openstack/openstack-ansible-openstack_hosts,openstack/openstack-ansible-openstack_hosts