Code review comment for lp:~alan-griffiths/mir/spike-nested-server-test-fixture

> If running all the acceptance tests (not just the groups that ctests runs)
> there's an interaction with
> ServerShutdown/OnSignal.removes_endpoint_on_signal/* (which now hangs/times
> out)

Fixed the immediate problem, but there's still a potential issue with "emergency cleanup" of multiple in-process servers. Will tease out a test case for a future MP.