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/controller/postgresql.go

@@ -53,7 +53,9 @@ func (c *Controller) clusterListFunc(options api.ListOptions) (runtime.Object, e
 		c.clusters[clusterName] = cl
 		cl.LoadResources()
 		go cl.Run(stopCh)
+
 		cl.ListResources()
+		cl.SyncCluster()
 	}
 	if len(c.clusters) > 0 {
 		c.logger.Infof("There are %d clusters currently running", len(c.clusters))