Adds support for Cloudwatch detailled monitoring in ec2_lc module.

Enabling detailled monitoring in the launch config is mandatory to be able to activate cloudwatch in the to be created autoscaling group.
Merge pull request #7896 from botify-labs/feature/add-instance-monitoring-to-ec2-lc

Adds support for Cloudwatch detailled monitoring in ec2_lc module.