Add GetUTXO service flag to NodeServices
Add GetUTXO service flag to NodeServices

for 0.11
see: ed555422562a7279773a89cfa084cb5824e2bf22@8e4fd0c

MetacoSA/NBitcoin,bitcoinbrisbane/NBitcoin,dangershony/NStratis,stratisproject/NStratis,you21979/NBitcoin,thepunctuatedhorizon/BrickCoinAlpha.0.0.1,lontivero/NBitcoin,NicolasDorier/NBitcoin,MetacoSA/NBitcoin,HermanSchoenfeld/NBitcoin