1. Proposed title of this feature request
Expose HAProxy idle-close-on-response option in the Openshift ingress controller

2. What is the nature and description of the request?
Make the "option idle-close-on-response"/"no option idle-close-on-response" HAProxy setting (https://docs.haproxy.org/2.4/configuration.html#4-option%20idle-close-on-response)
administratively configurable through Openshift, for example through the
ingresscontroller.spec.tuningOptions which already expose several related HAProxy options.

3. Why does the customer need this? (List the business requirements here)
To increase stability of client-server communication for types of clients during HAProxy configuration reloads, as also listed in the HAProxy documentation linked above.

4. List any affected packages or components.