lnwallet: implement FetchOpenChannel and PutOpenChannel
lnwallet: implement FetchOpenChannel and PutOpenChannel

AndrewSamokhvalov/lnd,ddustin/lnd,aakselrod/lnd,ddustin/lnd,BitfuryLightning/lnd,bryanvu/lnd,BitfuryLightning/lnd,aakselrod/lnd,LightningNetwork/lnd,LightningNetwork/lnd,AndrewSamokhvalov/lnd,bryanvu/lnd