Add forfeit address in GetInfo (#326)

* keep track of forfeit transaction funds

* [btc-embedded] use p2wpkh address

* [sdk] fix clients

* use script as argument of BuildForfeitTxs

client/main.go

@@ -233,6 +233,7 @@ func config(ctx *cli.Context) error {
 		"dust":                         cfgData.Dust,
 		"boarding_descriptor_template": cfgData.BoardingDescriptorTemplate,
 		"explorer_url":                 cfgData.ExplorerURL,
+		"forfeit_address":              cfgData.ForfeitAddress,
 	}
 
 	return printJSON(cfg)