FELIX-4025 Cleanup InventoryPrinter API

- Rename PrinterMode to Format
- Reorder InventoryPrinter.print arguments
- Rename InventoryPrinter constants
- Relax InventoryPrinter service property requirements

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1468887 13f79535-47bb-0310-9956-ffa450edef68