Update repository image for airflow components to use bitnamilegacy

Change-Id: Ieddc007a6940783150a09ff0ab6c98ecfe558fdc
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/helm/osm/values.yaml b/installers/helm/osm/values.yaml
index 5155af2..f60782d 100644
--- a/installers/helm/osm/values.yaml
+++ b/installers/helm/osm/values.yaml
@@ -123,6 +123,10 @@
       # hosts:
       #   - name: "localhost"
       ingressClassName: nginx
+  postgresql:
+    image:
+      repository: bitnamilegacy/postgresql
+      tag: 11
   # scheduler:
   #   resources:
   #     requests: