ImportError: No module named oslo_log

py27 errorr:
Failed to import test module: magnumclient.tests.osc.unit.v1.test_cluster_templates
2017-09-21 16:32:33.071861 | Traceback (most recent call last):
2017-09-21 16:32:33.071928 | File "/home/jenkins/workspace/gate-python-magnumclient-python27-ubuntu-xenial/.tox/py27/local/lib/python2.7/site-packages/unittest2/loader.py", line 456, in _find_test_path
2017-09-21 16:32:33.071952 | module = self._get_module_from_name(name)
2017-09-21 16:32:33.072020 | File "/home/jenkins/workspace/gate-python-magnumclient-python27-ubuntu-xenial/.tox/py27/local/lib/python2.7/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
2017-09-21 16:32:33.072035 | __import__(name)
2017-09-21 16:32:33.072072 | File "magnumclient/tests/osc/unit/v1/test_cluster_templates.py", line 20, in <module>
2017-09-21 16:32:33.072101 | from magnumclient.osc.v1 import cluster_templates as osc_ct
2017-09-21 16:32:33.072133 | File "magnumclient/osc/v1/cluster_templates.py", line 20, in <module>
2017-09-21 16:32:33.072154 | from oslo_log import log as logging
2017-09-21 16:32:33.072175 | ImportError: No module named oslo_log
2017-09-21 16:32:33.072883 | Non-zero exit code (2) from test listing.
2017-09-21 16:32:33.072999 | error: testr failed (3)
2017-09-21 16:32:33.106491 | ERROR: InvocationError: '/home/jenkins/workspace/gate-python-magnumclient-python27-ubuntu-xenial/.tox/py27/bin/python setup.py testr --slowest --testr-args='
2017-09-21 16:32:33.106553 | py27 finish: runtests after 2.81 seconds

http://logs.openstack.org/57/506257/1/check/gate-python-magnumclient-python27-ubuntu-xenial/410f3c8/console.html