lnrpc: add ability to toggle persistent connections for ConnectPeer
lnrpc: add ability to toggle persistent connections for ConnectPeer

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