End of Icehouse support in Tempest

This tag signifies the end of support in Tempest for running against
the Icehouse release. Starting with this tag no commits are tested
against the Icehouse version of OpenStack. This tag also corresponds
with the end of upstream support for the Icehouse release.

After this tag the supported releases are:
 * Juno
 * Kilo

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

Start of Liberty support in Tempest

This tag signifies the start of support in Tempest for the Liberty
release. Starting with this tag Tempest official supports the
following releases:

 * Icehouse
 * Juno
 * Kilo
 * Liberty (current dev)

End of XML API support in tempest

This tag signifies the complete removal of all XML REST API testing
from tempest. At this point there are no XML API code left in the
repository. This tag still only supports Icehouse, Juno, and the
Kilo (current dev) releases.

Start of Kilo support in Tempest

This tag signifies the start of support in tempest for the Kilo
release. Starting with this tag Tempest supports Icehouse, Juno, and
the Kilo (current dev) releases.

Havana EOL

Start of branchless tempest. Supports running with the Icehouse and J…

…uno (dev) releases.

Grizzly EOL

Folsom EOL

Essex EOL

Diablo EOL