Make commonflags work with rke cert commands

cmd/cert.go

@@ -15,15 +15,7 @@ import (
 )
 
 func CertificateCommand() cli.Command {
-	return cli.Command{
-		Name:  "cert",
-		Usage: "Certificates management for RKE cluster",
-		Subcommands: cli.Commands{
-			cli.Command{
-				Name:   "rotate",
-				Usage:  "Rotate RKE cluster certificates",
-				Action: rotateRKECertificatesFromCli,
-				Flags: []cli.Flag{
+	rotateFlags := []cli.Flag{
 		cli.StringFlag{
 			Name:   "config",
 			Usage:  "Specify an alternate cluster YAML file",
@@ -45,7 +37,17 @@ func CertificateCommand() cli.Command {
 			Name:  "rotate-ca",
 			Usage: "Rotate all certificates including CA certs",
 		},
-				},
+	}
+	rotateFlags = append(rotateFlags, commonFlags...)
+	return cli.Command{
+		Name:  "cert",
+		Usage: "Certificates management for RKE cluster",
+		Subcommands: cli.Commands{
+			cli.Command{
+				Name:   "rotate",
+				Usage:  "Rotate RKE cluster certificates",
+				Action: rotateRKECertificatesFromCli,
+				Flags:  rotateFlags,
 			},
 			cli.Command{
 				Name:   "generate-csr",