server: switch to SpyCarBasic.xml as default catalog

To match the documentation, the default catalog is now the SpyCarBasic.
Remove also legacy properties in killbill-server.properties.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
server: add valid default overdue config

No-op overdue config by default.

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
config: add @Description annotations

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>