generator improvements: core examples for plugin=none. creates simple random_pet

[tongueroo]

This is a 🐞 bug fix.
This is a 🙋‍♂️ feature or enhancement.
This is a 🧐 documentation change.

• I've added tests (if it's a bug, feature or enhancement)
• I've adjusted the documentation (if it's a feature or enhancement)
• The test suite passes (run bundle exec rspec to verify this)

Summary

Fixes and improve generator so that terraspace new project infra --plugin none --examples option works right off the bat. This brings in non-cloud provider support as a 1st class citizen.

Also:

• cody project for plugin=none
• fix builds
• codebuild: use tfenv to install terraform
• autodetect plugin improvements
• add Terraspace.check_project for rspec-terraspace
• allow terraspace build to work when aws creds not properly setup. nil.to_s

Context

• support non-cloud providers and backends #174

How to Test

terraspace new project infra --plugin none --examples
cd infra
terraspace new test demo --type stack
cd app/stacks/demo
terraspace test

See: https://github.com/boltops-tools/terraspace/blob/master/.cody/none/bin/build.sh

Version Changes

Minor