c3e0b8436a
The container_format and disk_format identifiers and their descriptions are being maintained in the Glance docs. Move some useful content on this topic over from the Image Guide before deleting it over there so it's only being maintained in one location. Change-Id: Ifa8de9d3a3a2aa78ee305aaebb23cd982b02dd91 Partial-bug: #1842343