Fix reading resource params with nested spec

[ggverma]

In Policy modules, the resources are nested. Because of this, we read the resource params from the supplied Ansible Playbook and manually validate it with the resource spec. However, we were not reading the resource params correctly if they were nested. This patch fixes that issue. In addition, we convert the new resource params and existing resource params into Ordered Data so that we can compare them and infer if there are any updates with better accuracy

Issue: #417