This ensures that when using automatic Kafka topic creation, with more than one
node in the Kafka cluster, all partitions in the topic are automatically
replicated. When a single node goes down in a >=3 node cluster, these topics will
continue to accept writes providing there are at least two insync replicas.
In a two node cluster, no failures are tolerated. In a three node cluster, only a
single node failure is tolerated. In a larger cluster the configuration may need
manual tuning.
This configuration follows advice given here:
[1] https://docs.cloudera.com/documentation/kafka/1-2-x/topics/kafka_ha.html#xd_583c10bfdbd326ba-590cb1d1-149e9ca9886--6fec__section_d2t_ff2_lq
Closes-Bug: #1888522
Change-Id: I7d38c6ccb22061aa88d9ac6e2e25c3e095fdb8c3
a273e28e20