limactl usernet: handle signal to close GVisorNetstack
#4028
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`*_ep.sock`, `*_fd.sock`, and `*_qemu.sock` will be properly removed on exit with the following changes: - Pass `signal.NotifyContext` to `usernet.StartGVisorNetstack`. - Close `http.Server` instead of `net.Listener`. - Fix mishandling of checking `http.ErrServerClosed`. - Check `ctx.Done()` outside of the loop calling `listener.Accept()` in `listenFD`, and `listenQEMU`. - Use `errors.Is(err, net.ErrClosed)` in `UDPFileConn.Read`. Since golang/go#4373 has been fixed. Signed-off-by: Norio Nomura <[email protected]>
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*_ep.sock,*_fd.sock, and*_qemu.sockwill be properly removed on exit with the following changes:signal.NotifyContexttousernet.StartGVisorNetstack.http.Serverinstead ofnet.Listener.http.ErrServerClosed.ctx.Done()outside of the loop callinglistener.Accept()inlistenFD, andlistenQEMU.errors.Is(err, net.ErrClosed)inUDPFileConn.Read.Since net: errClosing not exported golang/go#4373 has been fixed.