@andreaturli : Thanks for grammar fix & suggestions. Fixed in [Keystone v2-v3 authentication](https://393f4caa8037a748294f-756fd4e7d22e69a6f0ff4346cb78ae2b.ssl.cf5.rackcdn.com/guides/openstack/#keystone). Except about `KeystoneProperties.KEYSTONE_VERSION` ... not sure about that.
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