RCs for Strimzi 0.14.0

Jakub Scholz

The Release Candidate 1 for Strimzi Kafka Operators and Release Candidate 2 for Strimzi Bridge are now available. There is a lot of new features, so if you are interested in any of them feel free to test them and give us feedback.

The main changes in the operators include:
* Add support for configuring Ingress class (#1716)
* Add support for setting custom environment variables in all containers
* Add liveness and readiness checks to Mirror Maker
* Allow configuring loadBalancerIP for LoadBalancer type services
* Allow setting labels and annotations for Persistent Volume Claims
* Add support for Jaeger tracing in Kafka Mirror Maker and Kafka Connect
* Add support for deploying [Kafka Exporter](https://github.com/danielqsj/kafka_exporter)
* Add initial support for OAuth authentication

For more details and the upgrade procedure, go to: https://github.com/strimzi/strimzi-kafka-operator/releases/tag/0.14.0-rc1

The main changes in the Bridge include:
* Changed data types and enforced OpenAPI validation for `consumer.request.timeout.ms`, `enable.auto.commit`and `fetch.min.bytes`parameters on consumer creation. This is a breaking change.
* Added HTTP GET method on `/consumers/{groupid}/instances/{name}/subscription` endpoint for getting subscribed topics and related assigned partitions.
* Added automatic deletion of stale consumer after a configurable timeout if the HTTP DELETE is not called and the consumer is not used for long time.
* Various bug fixes.