{
    "subnet": {
        "subnet": {
            "network_id": "d32019d3-bc6e-4319-9c1d-6722fc136a22",
            "ip_version": 4,
            "cidr": "192.168.199.0/24"
        }
    }
}
{
    "subnet": {
        "network_id": "d32019d3-bc6e-4319-9c1d-6722fc136a22",
        "ip_version": 4,
        "cidr": "192.168.199.0/24"
    }
}
Fix wrong request json body of subnet creation
Fix wrong request json body of subnet creation

Actual request should not have nested subnet entry.

Change-Id: I70acf509fb1604b066827c39c18ae56266b3a5cf
Close-Bug: #1329098
