Image(s) Schema Properties.

Additional properties to image configuration for accessing image(s) schema data.

Added 'image_schema_json' and 'images_schema_json' properties to images config.
Updated image reference configs 'reference.json.config' to reflect the above changes.

Change-Id: I6801739c90a4bdf380b7b54b0694196aec1575fd
Merge "Image(s) Schema Properties."