This patch refactors the sample files of:
* instance-volume_attach-start
* instance-volume_attach-end
* instance-volume_attach-error
* instance-volume_detach-start
* instance-volume_detach-end
notifications to use a common InstanceActionVolumePayload sample data.
and refactor:
* instance-volume_swap-start
* instance-volume_swap-end
* instance-volume_swap-error
notifications to use a common InstanceActionVolumeSwapPayload sample data
Change-Id: I51fd194ac3b95be96db2676b4abf3df5a14d0faa