a158fe5844
IfaceStats struct gains rx_errors, tx_errors, rx_dropped, tx_dropped.
Stats output now shows error/drop line when any of these are non-zero:
eth0 rx: ...B tx: ...B
errors: rx=N tx=N drops: rx=N tx=N
Mirrors Linux ifconfig output format.
Suppresses the extra line when all counters are 0 (clean state).