[stable/odoo] fix upgrading existing deployments

In helm#17352 the `apiVersion` of the deployment resource was
updated to `apps/v1` in tune with the api's deprecated in k8s 1.16. This change however breaks
upgradability of existing odoo deployments with helm v3 (rc) as described in
helm/helm#6646.

To fix this, we have defined a `odoo.deployment.apiVersion` helper that returns the new
`apiVersion` only when k8s 1.16 or higher is in use.

Signed-off-by: Sameer Naik <sameersbn@vmware.com>

stable/odoo/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: odoo
-version: 11.1.11
+version: 11.1.12
 appVersion: 12.0.20191015
 description: A suite of web based open source business apps.
 home: https://www.odoo.com/

stable/odoo/templates/_helpers.tpl

@@ -124,3 +124,14 @@ but Helm 2.9 and 2.10 does not support it, so we need to implement this if-else
     {{- end -}}
 {{- end -}}
 {{- end -}}
+
+{{/*
+Return the appropriate apiVersion for deployment.
+*/}}
+{{- define "odoo.deployment.apiVersion" -}}
+{{- if semverCompare "<1.16-0" .Capabilities.KubeVersion.GitVersion -}}
+{{- print "extensions/v1beta1" -}}
+{{- else -}}
+{{- print "apps/v1" -}}
+{{- end -}}
+{{- end -}}

stable/odoo/templates/deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1
+apiVersion: {{ template "odoo.deployment.apiVersion" . }}
 kind: Deployment
 metadata:
   name: {{ template "odoo.fullname" . }}