Add table common/tables/nova-upgrade_levels.xml to config ref

The table nova-upgrade_levels.xml was not included, add it.

Change-Id: Ifa1c8445f52f702b0d37e722834678d549a4ba8b
Moved property listing into CLI

Moved listings for property keys and values into the CLI.
Removed listing from Image, and replaced with reference.
Edited Image Guide section, and added Compute config and
image-show example.

Partial-Bug: #1304114

Change-Id: I84bd59bab2eda16adbe80641fcb95c55959f5d9d
Imported Translations from Transifex

Change-Id: Ibe148fe2d539b36f0c8a62d3fae4987d5fc616da
Merge "Moved property listing into CLI"
Merge "Add table common/tables/nova-upgrade_levels.xml to config ref"
Merge "Imported Translations from Transifex"