Enable downloading binaries and containers

Enable downloading binaries and containers

The *download_run_once* kubespray config option allows to download
container images only once then push to cluster nodes and the
*download_localhost* option makes the installer node a delegate for
pushing images while running the deployment with ansible.

These two options pretends to reduce the amount of traffic during
the deployment time of the Kubernetes cluster.

Change-Id: I8239cebbf5c322ed52ae0a0bc8774e5e33aada3c
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-ID: MULTICLOUD-425