Comment 3 for bug 1715663

If tempest plugin entrypoint is not properly defined, on doing tempest list-plugins will give you error. For example I have changed something in zaqar tempest plugin entrypoint. Here is the things you can get:
[centos@zaqar-devstack zaqar]$ vim zaqar.egg-info/entry_points.txt
[centos@zaqar-devstack zaqar]$ tempest list-plugins
/usr/lib/python2.7/site-packages/eventlet/convenience.py:6: DeprecationWarning: EVENTLET_NO_GREENDNS is noop, dnspython is bundled and DNS resolution is always green
  from eventlet.green import socket
/opt/stack/cinder/cinder/tests/tempest/plugin.py:19: ImportWarning: Not importing directory '/opt/stack/cinder/cinder/tests/tempest/config': missing __init__.py
  from cinder.tests.tempest import config as project_config
Could not load 'zaqar_tests': No module named tempest_plugin.plugin
No module named tempest_plugin.plugin
[centos@zaqar-devstack zaqar]$
I hope it will solve your problem.