This change adds in automatic package upgrades to user data for
instances when we are using linux AMIs.

* Add some default user data to have updates on boot on Linux AMIs by default
* Update expected user data in tests

This change adds the ability to configure the ASG from
the cloudformation file in more detail.

Add automatic upgrades to cloud-init.

  - Added a delay to wait the ASG::HealthCheckGracePeriod
  - Add missing VPC class import to fab_tasks
  - Removed a `pass` statement no longer needed
  - Added a check on number of instances during the instance cycling loop

…s_done