Add PDB configuration toggle (#583)

* Don't create an impossible disruption budget for smaller clusters.
* sync PDB also on update

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

@@ -49,6 +49,7 @@ type KubernetesMetaConfiguration struct {
 	SpiloFSGroup                           *int64                `json:"spilo_fsgroup,omitempty"`
 	WatchedNamespace                       string                `json:"watched_namespace,omitempty"`
 	PDBNameFormat                          config.StringTemplate `json:"pdb_name_format,omitempty"`
+	EnablePodDisruptionBudget              *bool                 `json:"enable_pod_disruption_budget,omitempty"`
 	SecretNameTemplate                     config.StringTemplate `json:"secret_name_template,omitempty"`
 	ClusterDomain                          string                `json:"cluster_domain"`
 	OAuthTokenSecretName                   spec.NamespacedName   `json:"oauth_token_secret_name,omitempty"`

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

@@ -76,6 +76,11 @@ func (in *KubernetesMetaConfiguration) DeepCopyInto(out *KubernetesMetaConfigura
 		*out = new(int64)
 		**out = **in
 	}
+	if in.EnablePodDisruptionBudget != nil {
+		in, out := &in.EnablePodDisruptionBudget, &out.EnablePodDisruptionBudget
+		*out = new(bool)
+		**out = **in
+	}
 	out.OAuthTokenSecretName = in.OAuthTokenSecretName
 	out.InfrastructureRolesSecretName = in.InfrastructureRolesSecretName
 	if in.ClusterLabels != nil {