AWS: AutoScaling Groups can now update ELBs without recreating

[catsby]

ASGs now support attaching and detaching Elastic Load Balancers

Announcement:

• https://aws.amazon.com/blogs/aws/attach-and-detach-elastic-load-balancers-from-auto-scaling-groups/

APIs:

• http://docs.aws.amazon.com/AutoScaling/latest/APIReference/API_AttachLoadBalancers.html
• http://docs.aws.amazon.com/AutoScaling/latest/APIReference/API_DetachLoadBalancers.html

[catsby]

Implemented in #2472

[ghost]

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