Change default Enterprise 1.X replication factor to two

[davidby-influx]

ETA: Will be released with 1.12.3
PR: feat: change default replication factor to two from three

Change default RF for clusters of 3 or more nodes to 2.

Relevant URLs

• Enterprise 1.x - Change default for clusters with 4 or more data-nodes.

Enterprise and Cloud 1: InfluxDB Enterprise v1.12.3