Revert "add stream shutdown and support half-duplex operation" #41808
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Reverts #40783. This broke FreeBSD support by causing the Sockets tests to fail. In particular, in https://github.com/JuliaLang/julia/blob/master/stdlib/Sockets/test/runtests.jl#L524, the pipe was not closed automatically so
isopen(P)
is stilltrue
.