Fix and cleanup not required dns bits

* Do not manage hostnames for openstack cloud provider,
  let cloud-init to do its job.
* Make python-dns / dnspython dependency check conditional.
* Drop not used dns node flavor and image.
* Do not manage dns nodes and sec groups in heat stacks.
* Keep supporting dynamic updates for private DNS records, yet only
  limited to an external DNS managed elsewhere (not deployed by
  the openshift_openstack provider). So users may still benefit from
  this feature, sending nsupdates to private and public servers as
  they want it.
* Fix openstack default for external nsupdate keys. It should be
  undefined by default as the dns-populate logic is based on that.
* Fix dns records generation for openstack provider's populate-dns
* Update docs

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