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/cluster/cluster.go

@@ -711,8 +711,7 @@ func (c *Cluster) Update(oldSpec, newSpec *acidv1.Postgresql) error {
 			updateFailed = true
 			return
 		}
-
-		if !reflect.DeepEqual(oldSs, newSs) {
+		if !reflect.DeepEqual(oldSs, newSs) || !reflect.DeepEqual(oldSpec.Annotations, newSpec.Annotations) {
 			c.logger.Debugf("syncing statefulsets")
 			// TODO: avoid generating the StatefulSet object twice by passing it to syncStatefulSet
 			if err := c.syncStatefulSet(); err != nil {