Addition of Tempest library interface

This tag signifies the addition of the tempest library interface to
the tempest project. This used to be an external project, tempest-lib,
but as of this tag this interface is exposed directly from tempest.

This tag still supports the same releases as the previous one, which
are:

 * Kilo
 * Liberty

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