document changed configmap default (#3116)

* document changed configmap default
* update config reference
* add warning message in sync
* address review comments

pkg/apis/acid.zalan.do/v1/operator_configuration_type.go

@@ -410,7 +410,7 @@ type OperatorConfigurationData struct {
 	// +kubebuilder:default=""
 	EtcdHost string `json:"etcd_host,omitempty"`
 	// +kubebuilder:default=true
-	KubernetesUseConfigMaps bool `json:"kubernetes_use_configmaps,omitempty"`
+	KubernetesUseConfigMaps *bool `json:"kubernetes_use_configmaps,omitempty"`
 	// +kubebuilder:default="ghcr.io/zalando/spilo-18:4.1-p1"
 	DockerImage string `json:"docker_image,omitempty"`
 	// +kubebuilder:validation:Minimum=1

pkg/apis/acid.zalan.do/v1/zz_generated.deepcopy.go

@@ -443,6 +443,11 @@ func (in *OperatorConfigurationData) DeepCopyInto(out *OperatorConfigurationData
 		*out = make([]string, len(*in))
 		copy(*out, *in)
 	}
+	if in.KubernetesUseConfigMaps != nil {
+		in, out := &in.KubernetesUseConfigMaps, &out.KubernetesUseConfigMaps
+		*out = new(bool)
+		**out = **in
+	}
 	if in.ResyncPeriod != nil {
 		in, out := &in.ResyncPeriod, &out.ResyncPeriod
 		*out = new(metav1.Duration)