add a stat for packets dropped from socket receive buffer #214
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… buffer overrun. uses linux-only socket option SO_RXQ_OVFL
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Adds a new socket stat "packets_dropped_by_kernel" to track the number of packets that have been dropped from the socket receive buffer over the lifetime of the socket.
This uses the Linux-only socket option SO_RXQ_OVFL, on other platform this stat is set to -1. nevertheless it may be useful to track.