htlcswitch: add tests to exercise payload verification and policy change s
htlcswitch: add tests to exercise payload verification and policy change s

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