This feature allows to distinguish paths to ingress instances deployed 
on same k8s cluster under different namespaces. 
This is done by ingress K8S configuration by definition of helm input parameters 
with list of FQDN names. 

By default the values are empty ('~' in yaml means null value).

ingress:
   hosts: ~

If there are values specified in the list(s), e.g.:

ingress:
   hosts:
   - myhost1
   - myhost2

The ingress instance will allow HTTP calls to myhost1 or myhost2 only.

In another ingress instance deployed on same k8s cluster (under different namespace), different list of host names should be specified.