Enhance "validate" to display a "wanted / found" section

[bdlamprecht]

Currently, in the validate section, it can be difficult to see differences between what is desired and that is the actual value.

This is to request some type of requested_value in addition to the existing actual_value in the compliance_report.

For example (using the Ansible napalm_validate module):

TASK [debug] ********************************************
ok: [btv-vba-a] => {
    "dev_validate": {
        "changed": false,
        "compliance_report": {
            "complies": false,
            "get_facts": {
                "complies": false,
                "extra": [],
                "missing": [],
                "present": {
                    "hostname": {
                        "requested_value: "foo-bar",
                        "actual_value": "btv-vba-a",
                        "complies": false,
                        "nested": false
                    }
                }
            },
            "skipped": []
        }
    }
}