Deploy combined with GCP, macOS, Terraform

[ody]

This commit includes the changes that were required to automate
the deployment of the PE XL architecture when Bolt and Terraform
were linked together on macOS, targeted at GCP. The use case
being a single Bolt plan that can quickly stamp out new
infrastructure for customers.

Reasoning for filesize.sh change is because of parameter
mismatches between Linux and macOS. Other changes are a result
of needing to access nodes using external IP address when
initiating automation from outside the cloud provider, e.x. your
laptop and requiring that all services are wired together using
internal DNS names.

[ody]

Currently working example of the use of proposed changes: https://github.com/puppetlabs/bolt-onebuttonpe/tree/master/Boltdir