Add the 'description' attribute to common image properties to allow
users to record the purpose of the image in a human-readable format
in an interoperable way.
Co-authored-by: zhangbailin <zhangbailin@inspur.com>
Co-authored-by: Brian Rosmaita <rosmaita.fossdev@gmail.com>
Change-Id: Id0b148190cfa5fb9851ad2085a6b1ac1e0e7e352
Blueprint: add-description-field-to-image