Bug #888629 and bug #888631 are two known transient failures caused by a
race introduced in revno 6170.

That race condition has been diagnosed (unfortunately incompletely :-( )
long ago as being caused by running a TCP server  and TCP client in the
same process.


The strategy would be to run the test servers in their own process to avoid the 
race entirely. This is a significant work, unlikely to happen soon.

I'll try to reproduce it locally when time permits, who knows, we may be
lucky and some change in python has made the race more obvious...

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https://bugs.launchpad.net/bugs/1269886

Title:
  autopkgtest fails in trusty:
  TestSmartTCPServer.test_graceful_shutdown_waits_for_clients_to_stop

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