unittest broken: DuplicateOptError: duplicate option: rpc_backend

[ZhiQiang Fan]

after update to latest master code and run tox -epy27 -- tests.api.v2.test_app, it complains that

Traceback (most recent call last):
  File "ceilometer/tests/api/__init__.py", line 89, in setUp
    messaging.setup("fake://")
  File "ceilometer/messaging.py", line 37, in setup
    aliases=_ALIASES)
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/messaging/transport.py", line 166, in get_transport
    conf.register_opts(_transport_opts)
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/config/cfg.py", line 1547, in __inner
    result = f(self, *args, **kwargs)
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/config/cfg.py", line 1687, in register_opts
    self.register_opt(opt, group, clear_cache=False)
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/config/cfg.py", line 1551, in __inner
    return f(self, *args, **kwargs)
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/config/cfg.py", line 1676, in register_opt
    if _is_opt_registered(self._opts, opt):
  File "/home/zqfan/openstack/ceilometer-master/.tox/py27/local/lib/python2.7/site-packages/oslo/config/cfg.py", line 516, in _is_opt_registered
    raise DuplicateOptError(opt.name)
DuplicateOptError: duplicate option: rpc_backend

but jenkins doesn't complain, it is weird

[gordon chung (chungg)]

you have stray pyc files... when we switched to oslo.messaging the code in openstack.common.rpc was removed... make sure the residual pyc files in openstack.common are gone.

setting this as incomplete for now in case someone else has same problem

[ZhiQiang Fan (aji-zqfan)]

I have run wrong command to clear pyc files

this time I run with: find ./ceilometer -name *.pyc | xargs -i rm -f {}

then it is ok