In the light of extending our eKMS support it will be helpful
to have a tighter use of the word "KMS".
KMS should refer to the actual component that manages keys.
The keyservice, also called KMS in the constellation code,
does not manage keys itself. It talks to a KMS backend,
which in turn does the actual key management.
* Wrap KMS deployment in one main chart that
deploys all other services. Other services will follow.
* Use .tgz via helm-package as serialization format
* Change Release type to carry chart as byte slice
* Remove KMSConfig
* Use json-schema to validate values
* Extend release.md to mention updating helm charts
