A rebase of leapp-respository to lastest upstream release (0.23.0). For the full list of changes, read:

• https://github.com/oamg/leapp-repository/releases/tag/v0.23.0

NOTE: the new leapp-repository version will be released in upstream in Feb. The ticket has been created in advance to have the possibility of continuous updates of the code to stay close to the upstream state.