Installing OpenShift 3.10 fails loading master-config.yaml

Issue

• Installing OpenShift 3.10 fails and control plane pods don't come up. The logs show the following error:

  # master-logs controllers controllers
  F0731 09:00:00.948780       1 start_api.go:68] could not load config file "/etc/origin/master/master-config.yaml" due to an error: error reading config: [pos 815]: json: decode bool: got first char "