We need to use custom IAM policy name used by the worker for
osbuild-executor on Fedora workers (in prod vs. stage). And we have the
same requirement for the CloudWatch log group used by the
osbuild-executor.
Modify the Ansible playbook used by Packer to use the values from
/tmp/cloud_init_vars if set and defaulting to the current values if not
set.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>