[COMMON] Bump ONAP version

Use version 9.0.0 for Istanbul
Also update the doc.

Issue-ID: OOM-1
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I03e11799bf487226784c98b04116f005c89d1e70
diff --git a/kubernetes/common/mongo/Chart.yaml b/kubernetes/common/mongo/Chart.yaml
index ad35ea0..84e1ea6 100644
--- a/kubernetes/common/mongo/Chart.yaml
+++ b/kubernetes/common/mongo/Chart.yaml
@@ -1,4 +1,4 @@
-# Copyright © 2018 Orange
+# Copyright © 2018, 2021 Orange
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,4 +15,4 @@
 apiVersion: v1
 description: MongoDB Server
 name: mongo
-version: 8.0.0
+version: 9.0.0