Fix openldap download URL and add SHA256 check
The SHA256 check will catch corrupt/incomplete downloads.
Fixes https://gitlab.com/gitlab-org/gitlab-development-kit/issues/177
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The SHA256 check will catch corrupt/incomplete downloads.
Fixes https://gitlab.com/gitlab-org/gitlab-development-kit/issues/177