aws-ha-release doesn't support new application load balancer

[carmenlau]

Hi,

In aws-ha-release.sh, load balancer are used for the healthy check. But when we are using the new application load balancer, autoscaling group do not need to assign a classic load balancer. asg_elbs will be empty. The instance health check will be fail too.

Since this tool is now abandonware, I have (loosely based on this script) implemented this feature on a replacement script for aws-ha-release, called aws-autoscaling-rollout. Please feel free to try it and provide any feedback/bugs in Github. Cheers!