Description of problem:
In the Liberty lifecycle some tempest-style tests (namely: tempest tests for python-saharaclient python clients) have have migrated to use the Tempest Plugin interface, i.e. tests are automagically discovered thanks to a special entry point exported through setup.py.

See also:

The problem is that the code for those tests (tests.tempest.scenario.data_processing.plugin) is not available in the package, but the entry point is exported in setup.py (see 
/usr/lib/python2.7/site-packages/sahara-3.0.1-py2.7.egg-info/entry_points.txt, which comes from openstack-sahara-common) and the listing of tests breaks.
Please note that Manila (which also had more tests migrated to tempest format) ships the tests in the python-manila package.

The tests should either be packaged (or the entry point removed, but then it means using a virtualenv where to install sahara to run them).


Version-Release number of selected component (if applicable):
openstack-tempest-liberty-20160126.1.el7ost.noarch
openstack-sahara-api-3.0.1-1.el7ost.noarch
openstack-sahara-common-3.0.1-1.el7ost.noarch
openstack-sahara-engine-3.0.1-1.el7ost.noarch


How reproducible:
Install openstack-tempest
cd /usr/share/openstack-tempest-liberty
testr list-tests


Actual results:
# testr list-tests
running=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-500} \
OS_TEST_LOCK_PATH=${OS_TEST_LOCK_PATH:-${TMPDIR:-'/tmp'}} \
${PYTHON:-python} -m subunit.run discover -t ${OS_TOP_LEVEL:-./} ${OS_TEST_PATH:-./tempest/test_discover} --list 
No handlers could be found for logger "tempest.test_discover.plugins"
--- import errors ---
Failed to call load_tests:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/unittest2/loader.py", line 136, in loadTestsFromModule
    return load_tests(self, tests, pattern)
  File "tempest/test_discover/test_discover.py", line 27, in load_tests
    ext_plugins = plugins.TempestTestPluginManager()
  File "/usr/lib/python2.7/site-packages/tempest_lib/common/utils/misc.py", line 30, in getinstance
    instances[cls] = cls()
  File "tempest/test_discover/plugins.py", line 77, in __init__
    on_load_failure_callback=self.failure_hook)
  File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 92, in __init__
    verify_requirements)
  File "/usr/lib/python2.7/site-packages/stevedore/extension.py", line 170, in _load_plugins
    self._on_load_failure_callback(self, ep, err)
  File "tempest/test_discover/plugins.py", line 82, in failure_hook
    raise err
ImportError: No module named tests.tempest.scenario.data_processing.plugin