Comment 1 for bug 1546506

Traceback example:
ft2.9: neutron.tests.functional.agent.l3.test_dvr_router.TestDvrRouter.test_dvr_ha_router_failover_StringException: Empty attachments:
  stdout

pythonlogging:'': {{{WARNING [oslo_config.cfg] Option "verbose" from group "DEFAULT" is deprecated for removal. Its value may be silently ignored in the future.}}}
stderr: {{{
Traceback (most recent call last):
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/greenpool.py", line 82, in _spawn_n_impl
    func(*args, **kwargs)
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/wsgi.py", line 719, in process_request
    proto.__init__(sock, address, self)
  File "neutron/agent/linux/utils.py", line 381, in __init__
    server)
  File "/usr/lib/python2.7/SocketServer.py", line 647, in __init__
    self.setup()
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/wsgi.py", line 306, in setup
    conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
  File "/usr/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 95] Operation not supported
Traceback (most recent call last):
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/greenpool.py", line 82, in _spawn_n_impl
    func(*args, **kwargs)
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/wsgi.py", line 719, in process_request
    proto.__init__(sock, address, self)
  File "neutron/agent/linux/utils.py", line 381, in __init__
    server)
  File "/usr/lib/python2.7/SocketServer.py", line 647, in __init__
    self.setup()
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/wsgi.py", line 306, in setup
    conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
  File "/usr/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 95] Operation not supported
}}}

Traceback (most recent call last):
  File "neutron/tests/functional/agent/l3/test_dvr_router.py", line 654, in test_dvr_ha_router_failover
    utils.wait_until_true(lambda: router1.ha_state == 'backup')
  File "neutron/agent/linux/utils.py", line 326, in wait_until_true
    eventlet.sleep(sleep)
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/greenthread.py", line 34, in sleep
    hub.switch()
  File "/opt/stack/new/neutron/.tox/dsvm-functional-constraints/local/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 294, in switch
    return self.greenlet.switch()
eventlet.timeout.Timeout: 60 seconds