Subnets should be part of VirtualNetwork

[vermacodes]

To be able to provide feature to add multiple virutal network, we need to fix the vnet and subnets relationship. I propose that subnets should be part of a specific vnet. so instead of

    "virtualNetworks": [
        {
            "addressSpace": [
                "10.1.0.0/16"
            ]
        }
    ],
    "subnets": [
        {
            "addressPrefixes": [
                "10.1.1.0/24"
            ],
            "name": "AzureFirewallSubnet"
        },
        {
            "addressPrefixes": [
                "10.1.2.0/24"
            ],
            "name": "JumpServerSubnet"
        },
        {
            "addressPrefixes": [
                "10.1.3.0/24"
            ],
            "name": "KubernetesSubnet"
        },
        {
            "addressPrefixes": [
                "10.1.4.0/24"
            ],
            "name": "AppGatewaySubnet"
        },
        {
            "addressPrefixes": [
                "10.1.5.0/24"
            ],
            "name": "AROMasterSubnet"
        },
        {
            "addressPrefixes": [
                "10.1.6.0/24"
            ],
            "name": "AROWorkerSubnet"
        },
        {
            "addressPrefixes": [
                "10.1.7.0/24"
            ],
            "name": "KubernetesVirtualNodeSubnet"
        }
    ],

it should be

    "virtualNetworks": [
        {
            "addressSpace": [
                "10.1.0.0/16"
            ],
            "subnets": [
                {
                    "addressPrefixes": [
                        "10.1.1.0/24"
                    ],
                    "name": "AzureFirewallSubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.2.0/24"
                    ],
                    "name": "JumpServerSubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.3.0/24"
                    ],
                    "name": "KubernetesSubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.4.0/24"
                    ],
                    "name": "AppGatewaySubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.5.0/24"
                    ],
                    "name": "AROMasterSubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.6.0/24"
                    ],
                    "name": "AROWorkerSubnet"
                },
                {
                    "addressPrefixes": [
                        "10.1.7.0/24"
                    ],
                    "name": "KubernetesVirtualNodeSubnet"
                }
            ],
        }
    ]