Remove node builder from test that purely covers JSON encoding/decoding.
Remove node builder from test that purely covers JSON encoding/decoding.

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