Ensure the ELB Service Role exists

In AWS accounts that have never created a load balancer before, it's possible that the service role for ELB might not exist yet.

We can check for the role, and create it if it's missing.

Copy/Paste the following commands into your Cloud9 workspace:

aws iam get-role --role-name "AWSServiceRoleForElasticLoadBalancing" || aws iam create-service-linked-role --aws-service-name "elasticloadbalancing.amazonaws.com"