Description of problem:

The cinder tempest test called 'cinder.tests.tempest.api.volume.test_volume_unicode.CinderUnicodeTest' [1] fails due to incompatibility between python-tempest and python-cinder-tests package version.

Version-Release number of selected component (if applicable):
RHOS 11 (Ocata)
python-cinder-tests-10.0.1-1.el7ost.noarch
python-tempest-15.0.0-2.el7ost.noarch
openstack-tempest-15.0.0-2.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Install tempest & cinder tests
2. Run cinder.tests.tempest.api.volume.test_volume_unicode.CinderUnicodeTest

Actual results:
{0} setUpClass (cinder.tests.tempest.api.volume.test_volume_unicode.CinderUnicodeTest) [0.000000s] ... FAILED
========================================
_StringException: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/tempest/test.py", line 273, in setUpClass
    six.reraise(etype, value, trace)
  File "/usr/lib/python2.7/site-packages/tempest/test.py", line 266, in setUpClass
    cls.resource_setup()
  File "/usr/lib/python2.7/site-packages/cinder/tests/tempest/api/volume/test_volume_unicode.py", line 35, in resource_setup
    cls.volume = cls.create_volume_with_args(name=cls.volume_name)
  File "/usr/lib/python2.7/site-packages/cinder/tests/tempest/api/volume/test_volume_unicode.py", line 47, in create_volume_with_args
    waiters.wait_for_volume_resource_status(cls.volumes_client,
AttributeError: 'module' object has no attribute 'wait_for_volume_resource_status'

Additional info:

A commit has been backported in python-cinder-tests Ocata [2] but the associated code in python-tempest is only present since 16.0.0 (OSP12/Pike) [3]
This test is used in the cinder certification program for cinder volumes.

[1] https://github.com/openstack/cinder/blob/stable/ocata/cinder/tests/tempest/api/volume/test_volume_unicode.py
[2] https://github.com/openstack/cinder/commit/b05afc3fbae2c82f89c8f0bbda31c79169595fc6
[3] https://github.com/openstack/tempest/commit/52d7b0d62600b24f516070a4cc5f4194d5cffc76