Sync clusters states

* move statefulset creation from cluster spec to the separate function
* sync cluster state with desired state;
* move out from arrays for cluster resources;
* recreate pods instead of deleting them in case of statefulset change
* check for master while creating cluster/updating pods
* simplify retryutil
* list pvc while listing resources
* name kubernetes resources with capital letter
* do rolling update in case of env variables change

pkg/util/util.go

@@ -45,6 +45,10 @@ func PodClusterName(pod *v1.Pod) spec.ClusterName {
 	return spec.ClusterName{}
 }
 
+func PodSpiloRole(pod *v1.Pod) string {
+	return pod.Labels["spilo-role"]
+}
+
 func ClusterDNSName(clusterName, teamName, hostedZone string) string {
 	return fmt.Sprintf("%s.%s.%s", clusterName, teamName, hostedZone)
 }