lnwallet: properly set FeeEstimator within integration tests
lnwallet: properly set FeeEstimator within integration tests

ddustin/lnd,aakselrod/lnd,LightningNetwork/lnd,AndrewSamokhvalov/lnd,LightningNetwork/lnd,AndrewSamokhvalov/lnd,ddustin/lnd,aakselrod/lnd