Introduce socket shutdown into connection type, used if a fork is active (#11376)
Introduce socket `shutdown()` into connection type, and use it on normal socket if a fork is active. This allows us to close client connections when there are child processes sharing the file descriptors. Fixes #10077. The reason is that since the `fork()` child is holding the file descriptors, the `close` in `unlinkClient -> connClose` isn't sufficient. The client will not realize that the connection is disconnected until the child process ends. Let's try to be conservative and only use shutdown when the fork is active.
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