Add config to store subnet license (#13194)

Command to set subnet license:

`mc admin config set {alias} subnet license={token}`

Signed-off-by: Shireesh Anjal <shireesh@minio.io>
Co-authored-by: Harshavardhana <harsha@minio.io>

cmd/common-main.go

@@ -155,8 +155,8 @@ func minioConfigToConsoleFeatures() {
 	}
 	os.Setenv("CONSOLE_MINIO_REGION", globalServerRegion)
 	os.Setenv("CONSOLE_CERT_PASSWD", env.Get("MINIO_CERT_PASSWD", ""))
-	if globalSubnetLicense != "" {
-		os.Setenv("CONSOLE_SUBNET_LICENSE", globalSubnetLicense)
+	if globalSubnetConfig.License != "" {
+		os.Setenv("CONSOLE_SUBNET_LICENSE", globalSubnetConfig.License)
 	}
 }
 
@@ -602,8 +602,6 @@ func handleCommonEnvVars() {
 	if tiers := env.Get("_MINIO_DEBUG_REMOTE_TIERS_IMMEDIATELY", ""); tiers != "" {
 		globalDebugRemoteTiersImmediately = strings.Split(tiers, ",")
 	}
-
-	globalSubnetLicense = env.Get(config.EnvMinIOSubnetLicense, "")
 }
 
 func logStartupMessage(msg string) {