Bug 1959 fixed: added the functionality of obtaining the KDU status for KNFs...

Bug 1959 fixed: added the functionality of obtaining the KDU status for KNFs based on both versions of Helm Charts

Also added the feature of updating the K8s namespace in the
_on_update_k8s_db method.

Change-Id: I7f3115091916c661eb0b7051a9ec7854bf63b81d
Signed-off-by: Pedro Escaleira <escaleira@av.it.pt>