BasicManagement: Fix Ping class constructor parameters order

- Ping test class constructor parameters were not correctly
ordered.

Fix issue: https://github.com/jku/rygel/issues/15

Signed-off-by: Christophe Guiraud <christophe.guiraud@intel.com>
Merge pull request #16 from cguiraud/dev

BasicManagement: Fix Ping class constructor parameters order