intermittent failure in auditConfigSuite.TestInvalidConfigLogsAndDiscards

[Tim Penhey]

auditconfig_test.go:110:
[LOG] 0:00.123 WARNING juju.apiserver discarding invalid audit config: logging enabled but no target provided
    c.Assert(messages[len(messages)-1:], jc.LogMatches, []jc.SimpleMessage{{
        loggo.WARNING, "discarding invalid audit config: logging enabled but no target provided",
    }})
... obtained checkers.SimpleMessages = SimpleMessages{
DEBUG Starting API http server on address "[::]:37341"
}
... expected checkers.SimpleMessages = SimpleMessages{
WARNING discarding invalid audit config: logging enabled but no target provided
}

[Tim Penhey (thumper)]

https://github.com/juju/juju/pull/8438