Jack Danger 4ad1ded244 Allow specifying ApiGateway logs role ARN
Since #6531 improved how we manage API Gateway's CloudWatch log IAM role
it's now simpler to allow hardcoding a role ARN in the YAML config.

This addresses [this
comment](https://github.com/serverless/serverless/pull/6591#discussion_r321010087)
and unblocks anyone who needs to keep the IAM permissions for an app
scoped to just that app.

Example usage:

    provider:
      name: aws
      logs:
        restApi:
          role:
            arn:aws:iam::123456789:role/a-service-with-all-necessary-permissions
2019-09-26 15:32:46 -07:00
..
2019-09-18 18:14:22 +03:00
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