support disable_log_color for console mode

cmd/frpc/main.go

@@ -15,6 +15,9 @@
 package main
 
 import (
+	"math/rand"
+	"time"
+
 	_ "github.com/fatedier/frp/assets/frpc/statik"
 	"github.com/fatedier/frp/cmd/frpc/sub"
 
@@ -23,6 +26,7 @@ import (
 
 func main() {
 	crypto.DefaultSalt = "frp"
+	rand.Seed(time.Now().UnixNano())
 
 	sub.Execute()
 }