* Adding minimum communication
The docs at https://docs.aws.amazon.com/eks/latest/userguide/sec-group-reqs.html specify that port 10250 is needed at a minimum for communication between the control plane, and the worker nodes. If you specify a `worker_sg_ingress_from_port` as something like `30000`, then this minimum communication is never established.
* Adding description to CHANGELOG.md
* Adjusting the naming of the resources
* Ensuring creation is conditional on the value of `worker_sg_ingress_from_port`
* Mistake, should be greater than port 10250