v0.3.0-rc2

1. EKS nodes are able to connect to public via http. In example, we need it to make cert-manager to work since it requests ACME challenge from public self via http during the self-check while creating a new certificate.
2. Enable nginx ingress snippets (it was disable in newer versions of nginx-ingress controller).
3. Remove redundant security group rules which were added due to misunderstanding of how they work.