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/command.go b/internal/pkg/commands/command.go
index d5a2785..d2951a3 100644
--- a/internal/pkg/commands/command.go
+++ b/internal/pkg/commands/command.go
@@ -157,6 +157,10 @@
 	NameLimit int    `short:"l" long:"namelimit" default:"-1" value-name:"LIMIT" description:"Limit the depth (length) in the table column name"`
 }
 
+type FlowIdOptions struct {
+	HexId bool `short:"x" long:"hex-id" description:"Output Ids in hex format"`
+}
+
 type ListOutputOptions struct {
 	OutputOptions
 	Filter  string `short:"f" long:"filter" default:"" value-name:"FILTER" description:"Only display results that match filter"`