htlcswitch: modify channelLink to use new create+verify commitment API
htlcswitch: modify channelLink to use new create+verify commitment API

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