Add the following notification when swapping volumes.
* 'instance.volume_swap.error'
Change-Id: I90d4ffcb2ffc318de2365a655b5fde8bb6c05ff2
Implements: blueprint add-swap-volume-notifications
Add the following notifications when swapping volumes.
* 'instance.volume_swap.start'
* 'instance.volume_swap.end'
A subsequent patch will add 'instance.volume_swap.error'.
Change-Id: Ic4d9d25bdc611221157e4663817e918b8d667ce9
Implements: blueprint add-swap-volume-notifications