Add Tests for Create/Delete/Show/List Group Types

Generic volume groups support was added to Cinder in the
Newton release. Group types APIs were added as part of that.
https://blueprints.launchpad.net/cinder/+spec/generic-volume-group

This patch adds the tempest tests for group types APIs
in Cinder. It tests the following APIs:

  * create group type
  * delete group type
  * show group type
  * list group types

Change-Id: Ic409db6f1258befc6f1772ea19e7e634170269f8
4 files changed