get_current_namespace broken due to authentication change

[carsonmh]

Currently get_current_namespace searches for a namespace file if there is an api_client present. The problem is, with the new authentication implementation, oc login isn't invoked, meaning that this namespace file may not be present. So its better to just use kubernetes API to search for namespace

[Maxusmusti]

Would be good to sync up with @Bobbins228 on this as well