OpenShift compatibility

[razvan]

Description

Part of the epic: stackabletech/issues#234

Acceptance criteria

• Can run Spark applications on OpenShift.
• The kuttl tests run on OpenShift.
• UPDATE: The values.yaml has been removed from operator-templating and can be customized per operator now. This isue changes the values.yaml file of the Helm chart. This file get's overwritten by the operator-templating. A solution for this has been found.

[lfrancke]

None of the checkboxes have been ticked, could you update the ticket?