add monitoring scripts to base images

Scripts are from amazon, they require a couple of perl libraries. Also require a policy like this applied to the role the machine is launched with

```
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "cloudwatch:*",
        "sns:*",
        "autoscaling:Describe*"
      ],
      "Resource": "*"
    }
  ]
}
```