Update examples/iam-policy.json for 1.0
Update examples/iam-policy.json for 1.0

- 1.0 features new calls to satisfy subnet selection and security
group management. In order for the controller to do these, new
ec2:* calls are required in the IAM policy. This commit adds those to
the example.

- Resolves https://github.com/coreos/alb-ingress-controller/issues/217

mgoodness/alb-ingress-controller,mgoodness/alb-ingress-controller