bugfix: namespace render

[chifu1234]

Signed-off-by: kevin kk@sudo-i.net
Helm does not render Namespace to a k8s resource which has no Namespace specified. The default behavior for Helm CLI is, that the Namespace from -n is parsed into the k8s resource. The same should happen for kusible.
Does not work:

apiVersion: v1
kind: Secret
metadata:
  name: bla
  labels: 
     name: bla

does work:

apiVersion: v1
kind: Secret
metadata:
  name: bla
  labels: 
     name: bla
     namespace {{ .Release.Namespace }}

Fix:
Using own implementation of interface RESTClientGetter => inventory.Kubeconfig, thus we can add a exported function to set namespace field SetNamespace. SetNamespace then loadConfig again and sets the proper namespace in every context.
Fixing namspace in ActionConfig because same function sets namespace for action.config (later used int action.install --> Release).

Bump Helm ...