close listening socket in #stop not to accept new connections anymore #1401
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This change is revival of #861, to close listening connections in #stop, not to accept connections to tell clients that this node denies incoming data now.
When
shared: true
, SocketManager in ServerEngine accepts connections. So plugin side cannot control it (this change doesn't affect to SM's behavior).But it's correct, because other workers may be able to handle connections newly coming.