feat: implement dynamodb without creation IAM users

[fnaranjo-vmw]

Related PR (needed for this PR to work):

• feat: implement dynamodb without creating IAM users cloud-service-broker#888

Checklist:

• Have you added Release Notes in the docs repositories?
• Have you ran make run-integration-tests and make run-terraform-tests?
• Have you ran acceptance tests for the service under change?
• Have you followed the Conventional Commits specification?

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/186333076

The labels on this github issue will be updated when the story is started.

[fnaranjo-vmw]

This change introduces a new property role_name.
In the ideal scenario, this role should exists and be configured with the following trust policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "allow-iam-arn-user-to-assume-this-role",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::000000000000:user/the-user-specified-in-the-iam-arn-property"
            },
            "Action": [
                "sts:AssumeRole",
                "sts:TagSession"
            ]
        }
    ]
}

The user corresponding to the iam-arn property should have the following additional permissions:

iam:GetRole
iam:GetRolePolicy
iam:DeleteRolePolicy
iam:PutRolePolicy

[blgm]

Closed due to no recent activity