"Guess" missing events

[flosell]

AS AN engineer that wants to create policies for terraform or cloudformation runs
I WANT trailscraper to guess permissions that likely are also necessary for the same infrastructure
SO THAT the generated policy works not only for the exact circumstances (e.g. an initial terraform apply) but also similar ones (e.g. terraform destroy/update of resources)

Examples

• We saw an event for iam:DeleteAccessKey so we also add iam:CreateAccessKey, iam:UpdateAccessKey and iam:ListAccessKeys

Notes

• Cloudonauts sources could possibly be used as a datasource to generate which IAM permissions exist
• Once we have a good list of IAM permissions we can find matching ones, e.g. Delete{Something} and Describe{Something} when we have a Create{Something} event
• This could be a separate command to make it more flexible and composable:

  $ trailscraper generate-policy | trailscraper expand-policy

[flosell]

Basic support added trailscraper guess. More coverage and smarter guessing will be split out into separate issues