anchor.diff:  `insecure`: Insecure indicates whether the registry is secure or insecure.
   By default, if not otherwise specified, the registry is assumed to be secure.
   
  -|`RegistrySources`
  +|`additionalTrustedCA`
  +|`additionalTrustedCA`: A reference to a ConfigMap containing additional CAs that
  +should be trusted during `ImageStream import`, `pod image pull`,
  +`openshift-image-registry pullthrough`, and builds.
  +
  +The namespace for this ConfigMap is `openshift-config`. The format of the
  +ConfigMap is to use the registry hostname as the key, and the PEM-encoded
  +certificate as the value, for each additional registry CA to trust.
  +
  +|`registrySources`
  +|`registrySources`: Contains configuration that determines how the container
  +runtime should treat individual registries when accessing images for builds and
  +pods. For instance, whether or not to allow insecure access. It does not contain
  +configuration for the internal cluster registry.
  +
  +|`externalRegistryHostnames`
  +|`externalRegistryHostnames`: Provides the hostnames for the default external
  +image registry. The external hostname should be set only when the image registry
  +is exposed externally. The first value is used in `publicDockerImageRepository`
  +field in ImageStreams. The value must be in `hostname[:port]` format.
  +
  +|`registrySources`
   |Holds cluster-wide information about how to handle the registries config.
   
   `insecureRegistries`: Registries which do not have a valid TLS certificate or
  
positive.code: [id="images-configuration-parameters_{context}"]
  = Image controller configuration parameters
  
  The `image.config.openshift.io/cluster` resource offers the following
  configuration parameters.
  
  [cols="3a,8a",options="header"]
  |===
  |Parameter |Description
  
  |`Image`
  |Holds cluster-wide information about how to handle images. The canonical, and
  only valid name is `cluster`.
  
  `spec`: Holds user-settable values for configuration. You can edit the `spec`
  subsection.
  
  `status`: Holds observed values from the cluster.
  
  |`ImageSpec`
  |`allowedRegistriesForImport`: Limits the container image registries from which
  normal users may import images. Set this list to the registries that you trust
  to contain valid images, and that you want applications to be able to
  
negative.code: from the API are not affected by this policy. Typically only cluster
  administrators will have the appropriate permissions.
  
  Every element of this list contains a location of the registry specified by the
  registry domain name. The domain name can include wildcards.
  
  `domainName`: Specifies a domain name for the registry. In case the registry uses a
  non-standard (80 or 443) port, the port should be included in the domain name
  