Feature Request: Support Launch-Templates for t2/t3 unlimited configuration

[eedwards-sk]

Launch Configurations do not support configuring t2.unlimited or t3 bursting

This is due to AWS only supporting configuration of these options through launch templates.

This is a feature request to add support to use launch templates rather than launch configurations.

This is known to be a backwards incompatible change, thus this may be something for a much later release (major).

Edit: https://docs.aws.amazon.com/autoscaling/ec2/userguide/replace-launch-config.html

because AWS does describe a way to go from configuration to template, perhaps using some terraform logic we could create an upgrade path?

[eedwards-sk]

relevant issue: hashicorp/terraform-aws-vault#97

looks like our best bet for getting this implemented will be with 0.12+

[brikis98]

+1. Adding this with 0.12 should be a whole lot easier.

[acsrujan]

Hey, can this be revisited?

I'm not here for t3.unlimited but AWS raised an alarm saying ASG doesn't have a launch template.

[robmorgan]

Hi @acsrujan we don't have any time to work on this at the moment, but we're happy to review any PRs if you want to look into it?

[acsrujan]

Thanks @robmorgan

Added a quick draft PR #176

Will mark it as ready for review after following guidelines and testing it whenever I get time.