Review Forseti based Rego rules for Rego/OPA best practices

[dekuhn]

• [ ] Review Forseti related Policy Library rules to ensure we are following recommended best practices. These templates will be models for other rules and we want to ensure we are modeling the right behaviors in our Forseti scanning rules.

Best Practices Links: https://www.openpolicyagent.org/docs/latest/policy-performance/ https://www.openpolicyagent.org/docs/latest/policy-language/#best-practices-for-equality

[dekuhn]

@joecheuk FYI