Warning: Deprecation warning for cross namespace parameters (#3026)

* Deprecation warning for cross namespace parameters `builderNamespace`, `functionNamespace`
and `disableOwnerReference` flag.
* Do not mention the version

---------

Signed-off-by: Md Soharab Ansari <soharab.ansari@infracloud.io>

charts/fission-all/templates/NOTES.txt

@@ -1,3 +1,5 @@
+{{ template "deprecationWarnings" . }}
+
 1. Install the client CLI.
 
 Mac:

charts/fission-all/templates/_deprecation-warnings.tpl

@@ -0,0 +1,21 @@
+{{- define "deprecationWarnings" -}}
+{{- $deprecations := list -}}
+
+{{- if .Values.builderNamespace -}}
+{{- $deprecations = append $deprecations "The 'builderNamespace' parameter is deprecated and will be removed in future release." -}}
+{{- end -}}
+
+{{- if .Values.functionNamespace -}}
+{{- $deprecations = append $deprecations "The 'functionNamespace' parameter is deprecated and will be removed in future release." -}}
+{{- end -}}
+
+{{- if .Values.disableOwnerReference -}}
+{{- $deprecations = append $deprecations "The 'disableOwnerReference' flag is temporary addition and will be removed in future release." -}}
+{{- end -}}
+
+{{- if $deprecations -}}
+{{- range $deprecations }}
+{{- printf "WARNING: %s" . | nindent 0 }}
+{{- end -}}
+{{- end -}}
+{{- end -}}