Allow more configuration options for RabbitMQ and Redis (#875)

charts/rabbitmq/Chart.yaml

charts/rabbitmq/README.md

charts/rabbitmq/RELEASENOTES.md

charts/rabbitmq/templates/scripts.yaml

charts/rabbitmq/templates/statefulset.yaml

charts/rabbitmq/values.yaml

charts/redis/Chart.yaml

charts/redis/README.md

charts/redis/RELEASENOTES.md

charts/redis/templates/scripts.yaml

charts/redis/templates/statefulset.yaml

charts/redis/values.yaml