Make hubAcceptsClient optional (#370)

Signed-off-by: zhujian <[email protected]>

Author: zhujian7

cluster/v1/0000_00_clusters.open-cluster-management.io_managedclusters.crd.yaml

@@ -154,8 +154,6 @@ spec:
                   - key
                   type: object
                 type: array
-            required:
-            - hubAcceptsClient
             type: object
           status:
             description: Status represents the current status of joined managed cluster

cluster/v1/types.go

@@ -59,7 +59,7 @@ type ManagedClusterSpec struct {
 	// the namespace to grant the permision of access from the agent on the managed cluster.
 	// When the value is set to false, the namespace representing the managed cluster is
 	// deleted.
-	// +required
+	// +optional
 	HubAcceptsClient bool `json:"hubAcceptsClient"`
 
 	// LeaseDurationSeconds is used to coordinate the lease update time of Klusterlet agents on the managed cluster.