chore: implement zone

Crafting an anchor list with this last commit !18 (de87d1b5):

TASK [Display cluster_anchor for this node] ********************************************************************************************************************************************************
ok: [riri] => {
    "msg": [
        "Host: riri",
        "Current Zone: fr-test-1",
        "Others Zones: ['fr-test-2', 'fr-test-3', 'fr-test-4']",
        "Selected Zones: ['fr-test-2', 'fr-test-4']",
        "Cluster Anchor Hosts: ['loulou', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c010:b591::103,2a01:4f9:c012:8136::ff"
    ]
}
ok: [loulou] => {
    "msg": [
        "Host: loulou",
        "Current Zone: fr-test-2",
        "Others Zones: ['fr-test-1', 'fr-test-3', 'fr-test-4']",
        "Selected Zones: ['fr-test-1', 'fr-test-4']",
        "Cluster Anchor Hosts: ['riri', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c012:8136::100,2a01:4f9:c012:8136::ff"
    ]
}
ok: [fifi] => {
    "msg": [
        "Host: fifi",
        "Current Zone: fr-test-1",
        "Others Zones: ['fr-test-2', 'fr-test-3', 'fr-test-4']",
        "Selected Zones: ['fr-test-2', 'fr-test-4']",
        "Cluster Anchor Hosts: ['loulou', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c010:b591::103,2a01:4f9:c012:8136::ff"
    ]
}
ok: [donald] => {
    "msg": [
        "Host: donald",
        "Current Zone: fr-test-3",
        "Others Zones: ['fr-test-1', 'fr-test-2', 'fr-test-4']",
        "Selected Zones: ['fr-test-1', 'fr-test-4']",
        "Cluster Anchor Hosts: ['riri', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c012:8136::100,2a01:4f9:c012:8136::ff"
    ]
}
ok: [toto] => {
    "msg": [
        "Host: toto",
        "Current Zone: fr-test-1",
        "Others Zones: ['fr-test-2', 'fr-test-3', 'fr-test-4']",
        "Selected Zones: ['fr-test-2', 'fr-test-4']",
        "Cluster Anchor Hosts: ['loulou', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c010:b591::103,2a01:4f9:c012:8136::ff"
    ]
}
ok: [tutu] => {
    "msg": [
        "Host: tutu",
        "Current Zone: fr-test-4",
        "Others Zones: ['fr-test-1', 'fr-test-2', 'fr-test-3']",
        "Selected Zones: ['fr-test-1', 'fr-test-3']",
        "Cluster Anchor Hosts: ['riri', 'donald']",
        "Cluster Anchor: 2a01:4f9:c012:8136::100,2a01:4f9:c012:8136::1ff"
    ]
}
ok: [titi] => {
    "msg": [
        "Host: titi",
        "Current Zone: fr-test-2",
        "Others Zones: ['fr-test-1', 'fr-test-3', 'fr-test-4']",
        "Selected Zones: ['fr-test-1', 'fr-test-4']",
        "Cluster Anchor Hosts: ['riri', 'tutu']",
        "Cluster Anchor: 2a01:4f9:c012:8136::100,2a01:4f9:c012:8136::ff"
    ]
}

PLAY RECAP *****************************************************************************************************************************************************************************************
donald                     : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
fifi                       : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
loulou                     : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
riri                       : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
titi                       : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
toto                       : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
tutu                       : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0