Enforce secure transport policy on access logs bucket

[MaksimAniskov]

Description of changes: https://github.com/aws-cloudformation/cloudformation-cli/issues/623 Enforce "secure transport" bucket policy on the access logs bucket.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[PatMyron]

Merging/rebasing latest code should get rid of that pylint failure btw. No worries about the contract-integration failures, that's just forks not being able to access the main repo's secrets