cmd, node: add --nosub and node.Config.NoUSB to disable hw wallets

cmd/utils/flags.go

@@ -115,6 +115,10 @@ var (
 		Name:  "keystore",
 		Usage: "Directory for the keystore (default = inside the datadir)",
 	}
+	NoUSBFlag = cli.BoolFlag{
+		Name:  "nousb",
+		Usage: "Disables monitoring for and managine USB hardware wallets",
+	}
 	EthashCacheDirFlag = DirectoryFlag{
 		Name:  "ethash.cachedir",
 		Usage: "Directory to store the ethash verification caches (default = inside the datadir)",
@@ -729,6 +733,9 @@ func SetNodeConfig(ctx *cli.Context, cfg *node.Config) {
 	if ctx.GlobalIsSet(LightKDFFlag.Name) {
 		cfg.UseLightweightKDF = ctx.GlobalBool(LightKDFFlag.Name)
 	}
+	if ctx.GlobalIsSet(NoUSBFlag.Name) {
+		cfg.NoUSB = ctx.GlobalBool(NoUSBFlag.Name)
+	}
 }
 
 func setGPO(ctx *cli.Context, cfg *gasprice.Config) {