dsvm HA tests failing

[Anusha]

Recently, gate failing on HA tests with following error

Traceback (most recent call last):
  File "/usr/local/bin/congress-server", line 6, in <module>
    from congress.server.congress_server import main
  File "/opt/stack/new/congress/congress/server/congress_server.py", line 27, in <module>
    from oslo_log import log as logging
  File "/usr/local/lib/python2.7/dist-packages/oslo_log/log.py", line 48, in <module>
    from oslo_log import formatters
  File "/usr/local/lib/python2.7/dist-packages/oslo_log/formatters.py", line 29, in <module>
    from oslo_serialization import jsonutils
  File "/usr/local/lib/python2.7/dist-packages/oslo_serialization/jsonutils.py", line 43, in <module>
    from oslo_utils import timeutils
  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/timeutils.py", line 27, in <module>
    from monotonic import monotonic as now # noqa
  File "/usr/local/lib/python2.7/dist-packages/monotonic.py", line 169, in <module>
    raise RuntimeError('no suitable implementation for this system: ' + repr(e))
RuntimeError: no suitable implementation for this system: ImportError('cannot import name log',)

Ref:http://logs.openstack.org/74/537274/1/check/congress-devstack-api-mysql/4449f48/logs/testr_results.html.gz