[PR #9963/902e7b24 forwardport][3.12] Restore FlowControlDataQueue
class
#9965
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This is a forwardport of PR #9963 as merged into 3.11 (902e7b2).
We no longer use
FlowControlDataQueue
internally as it was removed in #9793. It was assumed (incorrectly) it was not used externally. At leastaiodocker
uses it. There may be others so we will restore it for 3.11.Please note that it will go away permanently in 4.x so its will probably be best to vendor the code in this PR if you will still need this class when 4.x is released.
fixes aio-libs/aiodocker#918