Revert kubelet to default to ttl cache secret/configmap behavior

Author: liggitt

cmd/kubeadm/app/util/config/testdata/defaulting/controlplane/defaulted.yaml

@@ -101,7 +101,7 @@ cgroupsPerQOS: true
 clusterDNS:
 - 10.192.0.10
 clusterDomain: cluster.global
-configMapAndSecretChangeDetectionStrategy: Watch
+configMapAndSecretChangeDetectionStrategy: Cache
 containerLogMaxFiles: 5
 containerLogMaxSize: 10Mi
 contentType: application/vnd.kubernetes.protobuf

cmd/kubeadm/app/util/config/testdata/defaulting/controlplane/defaulted_non_linux.yaml

@@ -101,7 +101,7 @@ cgroupsPerQOS: true
 clusterDNS:
 - 10.192.0.10
 clusterDomain: cluster.global
-configMapAndSecretChangeDetectionStrategy: Watch
+configMapAndSecretChangeDetectionStrategy: Cache
 containerLogMaxFiles: 5
 containerLogMaxSize: 10Mi
 contentType: application/vnd.kubernetes.protobuf

pkg/kubelet/apis/config/v1beta1/defaults.go

@@ -215,7 +215,7 @@ func SetDefaults_KubeletConfiguration(obj *kubeletconfigv1beta1.KubeletConfigura
 		obj.ContainerLogMaxFiles = utilpointer.Int32Ptr(5)
 	}
 	if obj.ConfigMapAndSecretChangeDetectionStrategy == "" {
-		obj.ConfigMapAndSecretChangeDetectionStrategy = kubeletconfigv1beta1.WatchChangeDetectionStrategy
+		obj.ConfigMapAndSecretChangeDetectionStrategy = kubeletconfigv1beta1.TTLCacheChangeDetectionStrategy
 	}
 	if obj.EnforceNodeAllocatable == nil {
 		obj.EnforceNodeAllocatable = DefaultNodeAllocatableEnforcement