* Run ec2_instance tests in parallel
* Make sure we spin up the iam_instance_role instances in the dedicated VPC
* Rework a little to only build one VPC while still running in parallel
* Start running the tests within shippable
* We only use setup_remote_tmp_dir for the version_fail tests, so only set it up once
* Make sure we clean up if we fail during Environment Setup
* Add a warning about running in parallel
* Minor review tweaks
* Remove unused file
