lnwire: add upfront shutdown script tlvs
lnwire: add upfront shutdown script tlvs

pooler/electrum-ltc,pooler/electrum-ltc,wakiyamap/electrum-mona,pooler/electrum-ltc,wakiyamap/electrum-mona,wakiyamap/electrum-mona,pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,spesmilo/electrum,spesmilo/electrum,spesmilo/electrum