Generate the service account output statically based on the service
account name and parent project. This allows, among other things, to use
service accounts as map keys (e.g. to be used in the `iam` argument in
other modules).
* remove sensitive attribute from VPN modules key output
* fix type error in service account example
* update CI Terraform version
* update VPN modules docs
* require version in compute mig module
* require version in compute mig module for scaling_schedules
* update compute mig test, move provider version requirement in fixture
Julio Castillo
Ludovico Magnocavallo