Revert the thread_pool destruction on shutdown, revert back the fix for issue https://github.com/chriskohlhoff/asio/issues/431 #751
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Removed destruction of the thread_pool on shutdown and left it to actual client destruction. Failing to do this causes illegal memory access during destruction of stands in the listener_service_impl.
Removed the work around of bug chriskohlhoff/asio#431.
Added correct handling of the invocation retry timer. If it is not assigned to a timer variable in the invocation then it will actually be destroyed immediately, which will cause the timer cancelled immediately on destruction but this is not what we want.
Also added couble check client shutdown on connection opening.
fixes #739