18.06 dev WAN speed drop

For Developers
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speedtest on home 200M fiber, WAN GbE port

Lede 17.01-SNAPSHOT, r3909-b6a1f43, Linux 4.4.135, RAMIPS MT7621
Download 223.37Mbps

OpenWrt 18.06-SNAPSHOT, r7009+3-48c5d6ab77, Linux 4.14.48, RAMIPS MT7621
Download 145.76Mbps