Scales down instances when memory utilization high

[vadixidav]

terraform-ecs-autoscale-alb/base-infra/modules/ecs-instances/main.tf

Line 115 in 0e6890c

alarm_actions = ["${aws_autoscaling_policy.scale_down.arn}"]

Should be scale_up. Currently scales down when memory utilization is high.

[jch254]

@vadixidav keen to open a PR? I plan to upgrade this to use Terraform 0.12 so will fix as a part of that upgrade otherwise. Cheers for spotting!