change cluster schema (#2026)

* change cluster schema

* change cluster schema

pkg/simple/client/multicluster/options.go

@@ -0,0 +1,26 @@
+package multicluster
+
+import "github.com/spf13/pflag"
+
+type Options struct {
+	// Enable
+	Enable           bool `json:"enable"`
+	EnableFederation bool `json:"enableFederation,omitempty"`
+}
+
+// NewOptions() returns a default nil options
+func NewOptions() *Options {
+	return &Options{
+		Enable:           false,
+		EnableFederation: false,
+	}
+}
+
+func (o *Options) Validate() []error {
+	return nil
+}
+
+func (o *Options) AddFlags(fs *pflag.FlagSet, s *Options) {
+	fs.BoolVar(&o.Enable, "multiple-clusters", s.Enable, ""+
+		"This field instructs KubeSphere to enter multiple-cluster mode or not.")
+}