Add support for additional labels for kibana deployment

[usamaahmadkhan]

Describe the feature:
Ability to add additional labels on services. (kibana)
Related #342 (now for kibana)
Describe a specific use case for the feature:
I'm using a kubernetes operator which reads labels from the service and creates ingresses on the basis of those labels. So I need to have the ability to add additional labels on the services.