Fix error handling and logging in imagepublishers/amipublisher.AddVolumes().
Fix error handling and logging in imagepublishers/amipublisher.AddVolumes().

Symantec/Dominator,rgooch/Dominator,keep94/Dominator,rgooch/Dominator,keep94/Dominator,keep94/Dominator,rgooch/Dominator,Symantec/Dominator,Symantec/Dominator