1. Proposed title of this feature request

Prevent no available subnets.

2. What is the nature and description of the request?

When using the OpenShift installer a customer can configure the cluster network and host prefix in such a way that only 1 or 2 host subnets are available thus preventing an install from completing. for a compact cluster (3 master nodes)

An example from a compact cluster install.

  clusterNetwork:
  - cidr: 192.168.80.0/22
    hostPrefix: 23 

3. Why does the customer need this? (List the business requirements here)

To prevent failed install attempts and improve the first-touch experience with the product.

4. List any affected packages or components.

Openshift installer.

network operator.