init.d/net-online: Support tun/tap devices

Added a single line that allows tun/tap interfaces to be properly handled. It
turns out that /sys/class/net/${interface}/operstate shows "unknown" for tun/tap
interfaces, not "up", which is the value that net-online depends on. So tun/tap
interfaces need minor special handling.

Author: john-r-graham

init.d/net-online.in

@@ -50,6 +50,7 @@ start ()
 		[ "$carrier" = 1 ] && : $((carriers += 1))
 		read operstate 2> /dev/null < /sys/class/net/$dev/operstate ||
 			operstate=
+		[ -e /sys/class/net/$dev/tun_flags ] && operstate=up
 		[ "$operstate" = up ] && : $((configured += 1))
 	done
 	[ $configured -eq $ifcount ] && [ $carriers -ge 1 ] && break