AETHER-1260 Better support of helm-kustomize for omec-control-plane chart

Change-Id: I24c22cbacca60e3b6c5c3bca7ec76c9c987c2b56
diff --git a/omec/omec-control-plane/templates/statefulset-pcrf.yaml b/omec/omec-control-plane/templates/statefulset-pcrf.yaml
index 45af96b..a7eb327 100644
--- a/omec/omec-control-plane/templates/statefulset-pcrf.yaml
+++ b/omec/omec-control-plane/templates/statefulset-pcrf.yaml
@@ -32,9 +32,9 @@
       nodeSelector:
         {{ .Values.nodeSelectors.pcrf.label }}: {{ .Values.nodeSelectors.pcrf.value }}
     {{- end }}
-    {{- if .Values.images.credentials }}
+    {{- if hasKey .Values.images "pullSecrets" }}
       imagePullSecrets:
-        - name: {{ .Release.Name }}.registry
+{{ toYaml .Values.images.pullSecrets | indent 8 }}
     {{- end }}
       serviceAccountName: pcrf
       initContainers: