Propagate annotations to the StatefulSet (#932)

* Initial commit

* Corrections

- set the type of the new  configuration parameter to be array of
  strings
- propagate the annotations to statefulset at sync

* Enable regular expression matching

* Improvements

-handle rollingUpdate flag
-modularize code
-rename config parameter name

* fix merge error

* Pass annotations to connection pooler deployment

* update code-gen

* Add documentation and update manifests

* add e2e test and introduce option in configmap

* fix service annotations test

* Add unit test

* fix e2e tests

* better key lookup of annotations tests

* add debug message for annotation tests

* Fix typos

* minor fix for looping

* Handle update path and renaming

- handle the update path to update sts and connection pooler deployment.
  This way no need to wait for sync
- rename the parameter to downscaler_annotations
- handle other review comments

* another try to fix python loops

* Avoid unneccessary update events

* Update manifests

* some final polishing

* fix cluster_test after polishing

Co-authored-by: Rafia Sabih <rafia.sabih@zalando.de>
Co-authored-by: Felix Kunde <felix-kunde@gmx.de>

pkg/util/config/config.go

@@ -34,6 +34,7 @@ type Resources struct {
 	SpiloPrivileged         bool                `name:"spilo_privileged" default:"false"`
 	ClusterLabels           map[string]string   `name:"cluster_labels" default:"application:spilo"`
 	InheritedLabels         []string            `name:"inherited_labels" default:""`
+	DownscalerAnnotations   []string            `name:"downscaler_annotations"`
 	ClusterNameLabel        string              `name:"cluster_name_label" default:"cluster-name"`
 	PodRoleLabel            string              `name:"pod_role_label" default:"spilo-role"`
 	PodToleration           map[string]string   `name:"toleration" default:""`