Give instances permission to complete lifecycle actions

Author: keithduncan

templates/aws-stack.yml

@@ -817,6 +817,7 @@ Resources:
               - autoscaling:DescribeAutoScalingInstances
               - autoscaling:SetInstanceHealth
               - autoscaling:TerminateInstanceInAutoScalingGroup
+              - autoscaling:CompleteLifecycleAction
             Resource: !Sub arn:${AWS::Partition}:autoscaling:${AWS::Region}:${AWS::AccountId}:autoScalingGroup:*:autoScalingGroupName/${AWS::StackName}-AgentAutoScaleGroup-*
           - Sid: Logging
             Effect: Allow