EC2 terminate allows partial terminations

When using ec2 it seems like all the instance ids that are given should either be terminated or none should be terminated? Currently it looks like the EC2 terminate operation can partially succeed, then throw an exception (thus signifying failure when actually some instances were terminated).

See: https://github.com/openstack/nova/blob/master/nova/api/ec2/cloud.py#L1318

You will notice that the instance ids are validated inside the loop, instead of beforehand, thus if instance ids 1, 2, 3 are passed in, 3 could be invalid, but 1 and 2 would have been terminated already, but an exception would be thrown for #3, thus sending a error back to the user, when really 2 instances were terminated.

That seems bad. Possible verify before u terminate and report partial success....