Codechange: [Network] split CloseSocket and CloseConnection more clearly (#9261)

* Codechange: [Network] split CloseSocket and CloseConnection more clearly

- CloseSocket now closes the actual OS socket.
- CloseConnection frees up the resources to just before CloseSocket.
- dtors call CloseSocket / CloseConnection where needed.

src/network/core/tcp_admin.cpp

@@ -34,10 +34,6 @@ NetworkAdminSocketHandler::NetworkAdminSocketHandler(SOCKET s) : status(ADMIN_ST
 	this->admin_version[0] = '\0';
 }
 
-NetworkAdminSocketHandler::~NetworkAdminSocketHandler()
-{
-}
-
 NetworkRecvStatus NetworkAdminSocketHandler::CloseConnection(bool error)
 {
 	delete this;