Tempest configuration fails with "duplicate option"

[Gabriele Cerami]

In master periodic jobs tempest is regularly failing to run.

For example logs at

https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/periodic-tripleo-ci-centos-7-ovb-3ctlr_1comp-featureset035-master/b234bbc/logs/undercloud/home/zuul/tempest.log.txt.gz#_2019-02-22_09_07_24

show

2019-02-22 09:07:24 | 2019-02-22 09:07:24.258 13 INFO tempest [-] Using tempest config file /etc/tempest/tempest.conf
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins [-] Plugin barbican_tests raised an exception trying to run register_opts: DuplicateOptError: duplicate option: barbican
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins Traceback (most recent call last):
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/tempest/test_discover/plugins.py", line 202, in register_plugin_opts
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins plug.obj.register_opts(conf)
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/barbican_tempest_plugin/plugin.py", line 34, in register_opts
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins group='service_available')
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2045, in __inner
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins result = f(self, *args, **kwargs)
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2283, in register_opt
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins return group._register_opt(opt, cli)
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 1489, in _register_opt
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins if _is_opt_registered(self._opts, opt):
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 360, in _is_opt_registered
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins raise DuplicateOptError(opt.name)
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins DuplicateOptError: duplicate option: barbican
2019-02-22 09:07:24 | 2019-02-22 09:07:24.341 13 ERROR tempest.test_discover.plugins 
2019-02-22 09:07:24 | 2019-02-22 09:07:24.384 13 ERROR tempest [-] 'list' object has no attribute 'dest'