feat: support nfs floating ips

[kristina-solovyova]

nfs_setup_protocol           = true
nfs_protocol_gateways_number = 3
nfs_protocol_gateway_secondary_ips_per_nic = 1

Successful scenario:

weka nfs interface-group --json
[
    {
        "allow_manage_gids": true,
        "gateway": "10.0.0.1",
        "ips": [
            "10.0.0.10",
            "10.0.0.12",
            "10.0.0.14"
        ],
        "name": "weka-ig",
        "ports": [
            {
                "host_id": "HostId<18>",
                "host_uid": "0e2beaed-58cb-d59e-02fb-2b972162cc0b",
                "port": "eth0",
                "status": "OK"
            },
            {
                "host_id": "HostId<19>",
                "host_uid": "5b0554c4-a862-27cb-e93d-b0e34d37090c",
                "port": "eth0",
                "status": "OK"
            },
            {
                "host_id": "HostId<20>",
                "host_uid": "9f5e8113-e94b-e1c5-b274-c250154fdc7e",
                "port": "eth0",
                "status": "OK"
            }
        ],
        "status": "OK",
        "subnet_mask": "255.255.255.0",
        "type": "NFS",
        "uid": "11cf3596-e206-4e52-a886-bf51a5ec59c3"
    }
]