Set DefaultClusterSet default value to true in feature gate (#344)

Signed-off-by: Rokibul Hasan <mdrokibulhasan@appscode.com>

Author: RokibulHasan7

feature/feature.go

@@ -96,7 +96,7 @@ var DefaultSpokeRegistrationFeatureGates = map[featuregate.Feature]featuregate.F
 // feature keys for registration hub controller.  To add a new feature, define a key for it above and
 // add it here.
 var DefaultHubRegistrationFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
-	DefaultClusterSet:          {Default: false, PreRelease: featuregate.Alpha},
+	DefaultClusterSet:          {Default: true, PreRelease: featuregate.Alpha},
 	V1beta1CSRAPICompatibility: {Default: false, PreRelease: featuregate.Alpha},
 	ManagedClusterAutoApproval: {Default: false, PreRelease: featuregate.Alpha},
 	ResourceCleanup:            {Default: false, PreRelease: featuregate.Alpha},