Assorted bug-fixes:
- OpenShift detection on OpenShfit 4.0 (#1405)
- Zookeeper leader selection during certificate renewal (#1404)
- Fix network policies between CO and Zookeeper (#1402)
- Fix several NPE exceptions (#1399, #1386)
- Fix RBAC issue when User Operator is listening to different namespace (#1391)
- Fix problem with upgrade form 0.8.x (#1397)
- Fix regular rolling updates outside of maintenance windows (#1398)
Minor improvements:
- Improve log message for unsupported Kafka versions (#1394)