Initial commit of boto_iam module and state

This commit adds a boto_iam module for adding/removing IAM roles,
instance profiles, and role policies. It also adds a boto_iam_role
state for ensuring an IAM role is present or absent, with its
associated instance profile and role policies.
Lint fixes for boto_iam
Import fix and remove an unnecessary function for boto_iam
Followup fixes for boto_iam
Lint fix for boto_iam_role state
Merge pull request #12203 from lyft/boto-iam

Initial commit of boto_iam module and state