Pod Rolling update

introduce Pod events channel;
add parsing of the MaintenanceWindows section;
skip deleting Etcd key on cluster delete;
use external etcd host;
watch for tpr/pods in the namespace of the operator pod only;

pkg/util/constants/constants.go

@@ -12,15 +12,25 @@ const (
 	ResourceCheckInterval = 3 * time.Second
 	ResourceCheckTimeout  = 10 * time.Minute
 
-	ResourceName = TPRName + "s"
-	ResyncPeriod = 5 * time.Minute
+	PodLabelWaitTimeout    = 10 * time.Minute
+	PodDeletionWaitTimeout = 10 * time.Minute
+
+	ResourceName    = TPRName + "s"
+	ResyncPeriodTPR = 5 * time.Minute
+	ResyncPeriodPod = 5 * time.Minute
+
+	SuperuserName       = "postgres"
+	ReplicationUsername = "replication"
 
 	//TODO: move to the operator spec
-	EtcdHost         = "etcd-client.default.svc.cluster.local:2379"
-	SpiloImage       = "registry.opensource.zalan.do/acid/spilo-9.6:1.2-p12"
-	PamRoleName      = "zalandos"
-	PamConfiguration = "https://info.example.com/oauth2/tokeninfo?access_token= uid realm=/employees"
+	EtcdHost           = "etcd-client.default.svc.cluster.local:2379"
+	SpiloImage         = "registry.opensource.zalan.do/acid/spilo-9.6:1.2-p12"
+	PamRoleName        = "zalandos"
+	PamConfiguration   = "https://info.example.com/oauth2/tokeninfo?access_token= uid realm=/employees"
+	PasswordLength     = 64
+	TeamsAPIUrl        = "https://teams.example.com/api/"
+	UserSecretTemplate = "%s.%s.credentials.%s.%s"
 
-	PasswordLength = 64
-	TeamsAPIUrl    = "https://teams.example.com/api/"
+	OAuthTokenSecretName = "postgresql-operator"
+	ServiceAccountName   = "operator"
 )