Spurious test failure maasserver.views.tests.test_rpc.RPCViewTest.test_rpc_info_when_rpc_advertise_running

FAIL: maasserver.views.tests.test_rpc.RPCViewTest.test_rpc_info_when_rpc_advertise_running
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/home/richardmccartney/Sites/maas/node-details-design-amendments-1.8/src/maasserver/views/tests/test_rpc.py", line 94, in test_rpc_info_when_rpc_advertise_running
    and IPAddress(addr).version == 4
  File "/usr/lib/python2.7/dist-packages/testtools/testcase.py", line 406, in assertThat
    raise mismatch_error
MismatchError: Differences: {
  u'ubuntu:pid=21083': Differences: [
Differences: [
'192.168.233.242' != u'172.17.42.1'
]
Differences: [
'172.17.42.1' != u'192.168.233.242'
]
],
}