git review Jenkins verification failure at gate-tacker-horizon-pep8-ubuntu-xenial

[futangw]

For recent tacker code git review (not only from me), the Jenkins verification failure at gate-tacker-horizon-pep8-ubuntu-xenial. Can someone get it fixed?

pep8 installed: pbr==2.0.0

pep8 runtests: commands[0] | flake8
    /home/jenkins/workspace/gate-tacker-pep8-ubuntu-xenial$ /home/jenkins/workspace/gate-tacker-pep8-ubuntu-xenial/.tox/pep8/bin/flake8

2017-03-02 12:39:53.023508 | File "/home/jenkins/workspace/gate-tacker-pep8-ubuntu-xenial/.tox/pep8/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 859, in resolve
2017-03-02 12:39:53.023556 | raise VersionConflict(dist, req).with_context(dependent_req)
2017-03-02 12:39:53.023645 | pkg_resources.VersionConflict: (pbr 2.0.0 (/home/jenkins/workspace/gate-tacker-pep8-ubuntu-xenial/.tox/pep8/lib/python2.7/site-packages), Requirement.parse('pbr<2.0,>=0.11'))
2017-03-02 12:39:53.033747 | ERROR: InvocationError: '/home/jenkins/workspace/gate-tacker-pep8-ubuntu-xenial/.tox/pep8/bin/flake8'

2017-03-02 12:39:53.033890 | ___________________________________ summary ____________________________________
2017-03-02 12:39:53.033921 | ERROR: pep8: commands failed
2017-03-02 12:39:53.044170 | + rc=1
2017-03-02 12:39:53.044253 | + '[' -e .tox/pep8/bin/pbr ']'
2017-03-02 12:39:53.044288 | + freezecmd=pbr
2017-03-02 12:39:53.044332 | + echo 'Begin pbr freeze output from test virtualenv:'
2017-03-02 12:39:53.044372 | Begin pbr freeze output from test virtualenv:

2017-03-02 12:39:53.470938 | + exit 1
2017-03-02 12:39:53.471171 | [Zuul] Task exit code: 1
2017-03-02 12:39:56.211617 | [Zuul] Job complete, result: FAILURE