add ability to expose Elasticsearch as an external route

This adds the ability to expose Elastisearch as a route outside of the
cluster.
- `openshift_logging_es_allow_external`: True (default is False) - if this is
  True, Elasticsearch will be exposed as a Route
- `openshift_logging_es_ops_hostname`: The external facing hostname to use for
  the route and the TLS server certificate (default is "es." +
  `openshift_master_default_subdomain`)

There are other similar parameters for the TLS server cert, key, and CA cert.
There are other similar parameters for when the OPS cluster is deployed e.g.
`openshift_logging_es_ops_allow_external`, etc.

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