Support private DNS names if public one is not available #43
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I made this change to allow using it for hosts that don't have public DNS names/IP addresses. If an instance doesn't have a public name, It tries to use an internal one. Ofc it is going work only when a proxy (bastion host) is configured.
If we have an LB in front of our application there is no need to keep hosts from the autoscaling group in the public subnet.