Updated openstack/openstack
Project: openstack/tempest  2fb786ba70e5f9b545bfc556e3f9117603497823

Sharing codes for cinder v1 and v2 tests

Tempest doesn't have enough Cinder v2 api tests. We need to add more
tests for it. Cinder v2 api only has some small updates, so v1 and v2
tests could share service client and test code.
This patch makes the follwoing initial chanages to support sharing
codes between v1 and v2:

1. Rename volumes v1 client to a base client, then create v1 and v2
   clients inheriting base client.
2. Create common base test class instead of
   BaseVolumeV1Test/BaseVolumeV2Test. They will be remove after all
   test classes using sharing codes.

Partially implements: blueprint cinder-v2-api-tests

Change-Id: I2c0139d82663563996fae702f8e5f29f7ae0a7a9