luci-base: rewrite luci.sys.net.conntrack()
luci-base: rewrite luci.sys.net.conntrack()

The new function is twice as fast as the old implementation and properly
summarizes outgoing and incoming byte and packet counters.

Signed-off-by: Jo-Philipp Wich <a9275913d515487ffaed469337a530ed202da558@openwrt.org>

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