VOLTHA/VOL-3478 : FlowId are logged as decimals and reported by voltctl as hex.

By Default flow-id would be in int format .
hex-id option is supported to display flow id in hex format.

Change-Id: I8b715613a6800b89a5dcedb8b90dc289b336bf24
diff --git a/internal/pkg/commands/devices.go b/internal/pkg/commands/devices.go
index dd0bfc8..2f0d8a8 100644
--- a/internal/pkg/commands/devices.go
+++ b/internal/pkg/commands/devices.go
@@ -91,6 +91,7 @@
 
 type DeviceFlowList struct {
 	ListOutputOptions
+	FlowIdOptions
 	Args struct {
 		Id DeviceId `positional-arg-name:"DEVICE_ID" required:"yes"`
 	} `positional-args:"yes"`
@@ -698,6 +699,7 @@
 func (options *DeviceFlowList) Execute(args []string) error {
 	fl := &FlowList{}
 	fl.ListOutputOptions = options.ListOutputOptions
+	fl.FlowIdOptions = options.FlowIdOptions
 	fl.Args.Id = string(options.Args.Id)
 	fl.Method = "device-flows"
 	return fl.Execute(args)