Implement TCP graceful shutdown in lifecycle interface.#719

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levy wants to merge 3 commits intomasterfrom

topic/tcpgracefulstop

Commits on Sep 9, 2021

TemporarySharedPtr: Followed changes in omnet with class descriptor.
levy
committed
IApskModulation: Fixed field types to be the same as in the existing C++ class.
levy
committed
TODO TCP: Implemented graceful stop operation which closes all open connections and waits for the close to be finished.
levy
committed