switch kiwi appliance to use systemsmanagement:crowbar:2.0:staging OBS project

Since this appliance is primarily for development, it makes more sense
to consume packages from the systemsmanagement:crowbar:2.0:staging OBS
project first, and from systemsmanagement:crowbar:2.0 second.
Merge pull request #1719 from aspiers/topic/kiwi-staging-repo

switch kiwi appliance to use systemsmanagement:crowbar:2.0:staging OBS p...