upload/aws: fail ImportSnapshot when the snapshot is deleted

When ImportSnapshot fails, it goes into the deleted state. However, the code
didn't consider this state as a failure. This commit fixes that.

Fixes #706

internal/upload/awsupload/awsupload.go

@@ -89,6 +89,11 @@ func WaitUntilImportSnapshotTaskCompletedWithContext(c *ec2.EC2, ctx aws.Context
 				Matcher: request.PathAllWaiterMatch, Argument: "ImportSnapshotTasks[].SnapshotTaskDetail.Status",
 				Expected: "completed",
 			},
+			{
+				State:   request.FailureWaiterState,
+				Matcher: request.PathAllWaiterMatch, Argument: "ImportSnapshotTasks[].SnapshotTaskDetail.Status",
+				Expected: "deleted",
+			},
 		},
 		Logger: c.Config.Logger,
 		NewRequest: func(opts []request.Option) (*request.Request, error) {