As a follow-up to OCPBUGS-43428, we want haproxy log to include response body when we detect api server as DOWN.

Currently all we can see is error code 500. It gives some info, but certainly not everything. We believe including response body may be of some help here.

Ref.: https://stackoverflow.com/questions/52732627/haproxy-how-to-log-response-body/69295914#69295914