daemon: timeout timer for qr_task ioreq
Currently there is only platform-defined timeout for I/O requests (connect, udp_send, write). In most cases this works very well since ICMP is leveraged for quick host inavailability, but if a datagram simply gets lost, it might wait for indefinite time. We need to set a timer after each I/O request and clear it on completion.
See uv_timer_t