Bug 11481 - get manual live migration working with all VMs

Changes:

- Added the resopnse object name for the SystemVmInstanceResponse that this new MigrateSystemVMCmd will return.

server/src/com/cloud/api/ApiResponseHelper.java

@@ -2318,6 +2318,7 @@ public class ApiResponseHelper implements ResponseGenerator {
                 vmResponse.setRole(router.getRole().toString());
             }
         }
+        vmResponse.setObjectName("systemvminstance");
         return vmResponse;
     }