IAAS-9: Reliably acquire and manage hosted computer systems and/or storage volumes

Executive Summary: 
This use case is identical to IAAS-8 except that the calling application should not have to handle common exceptions.
User Importance Summary: 
Researchers are increasingly using externally hosted ("cloud") virtual machines to extend their computing environments without requiring capital investment.
Target Communities and Sizes: 
Application developers - O(10) Science gateways - O(10)