Start of Newton development and Mitaka Release support

This tag signifies the start of Newton development and the release of
Mitaka. Starting with this tag Tempest officially supports the
following releases:

 * Kilo
 * Liberty
 * Mitaka

The release under current development as of this tag is Newton,
meaning that every Tempest commit is also tested against master during
the Newton cycle. However, this does not necessarily mean that using
Tempest as of this tag will work against a Newton (or future release)
cloud.
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