intermittent failure in worker/pubsub

FAIL: remoteserver_test.go:69: RemoteServerSuite.TestConnectPublished

[LOG] 0:00.001 DEBUG juju.centralhub created subscriber 0xc4202fa230 for 0x643400
[LOG] 0:00.001 DEBUG juju.centralhub created subscriber 0xc4202fa370 for 0x643400
[LOG] 0:00.002 DEBUG juju.worker.pubsub connecting to target
[LOG] 0:00.002 DEBUG juju.worker.pubsub open api to target: [localhost]
[LOG] 0:00.002 INFO juju.worker.pubsub forwarding connected machine-42 -> target
remoteserver_test.go:93:
    // Since we are just testing the remote, the code that makes sure the
    // published message is forwarded is the subscriber, so we will always
    // show empty queue and none sent.
    c.Check(r.IntrospectionReport(), gc.Equals, ""+
        " Status: connected\n"+
        " Addresses: [localhost]\n"+
        " Queue length: 0\n"+
        " Sent count: 0\n")
... obtained string = "" +
... " Status: disconnected\n" +
... " Addresses: [localhost]\n" +
... " Queue length: 0\n" +
... " Sent count: 0\n"
... expected string = "" +
... " Status: connected\n" +
... " Addresses: [localhost]\n" +
... " Queue length: 0\n" +
... " Sent count: 0\n"

[LOG] 0:00.026 DEBUG juju.worker.pubsub worker shutting down
[LOG] 0:00.026 DEBUG juju.worker.pubsub closing connection and clearing pending
OOPS: 20 passed, 1 FAILED