Merge: kernel-selftests-internal test_vxlan_mdb.sh with new tools

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/6416

JIRA: https://issues.redhat.com/browse/RHEL-77173

```
commit a8258e6
Author: Hangbin Liu <liuhangbin@gmail.com>
Date:   Wed Dec 6 15:07:55 2023 +0800

    selftests/net: convert test_vxlan_mdb.sh to run it in unique namespace

    Here is the test result after conversion.

    ]# ./test_vxlan_mdb.sh

    Control path: Basic (*, G) operations - IPv4 overlay / IPv4 underlay
    --------------------------------------------------------------------
    TEST: MDB entry addition                                            [ OK ]

    ...

    Data path: MDB torture test - IPv6 overlay / IPv6 underlay
    ----------------------------------------------------------
    TEST: Torture test                                                  [ OK ]

    Tests passed: 620
    Tests failed:   0

    Acked-by: David Ahern <dsahern@kernel.org>
    Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
    Reviewed-by: Ido Schimmel <idosch@nvidia.com>
    Tested-by: Ido Schimmel <idosch@nvidia.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>```

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

---

<small>Created 2025-02-24 09:49 UTC by backporter - [KWF FAQ](https://red.ht/kernel_workflow_doc) - [Slack #team-kernel-workflow](https://redhat-internal.slack.com/archives/C04LRUPMJQ5) - [Source](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/webhook/utils/backporter.py) - [Documentation](https://gitlab.com/cki-project/kernel-workflow/-/blob/main/docs/README.backporter.md) - [Report an issue](https://gitlab.com/cki-project/kernel-workflow/-/issues/new?issue%5Btitle%5D=backporter%20webhook%20issue)</small>

Approved-by: Antoine Tenart <atenart@redhat.com>
Approved-by: Guillaume Nault <gnault@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: Augusto Caringi <acaringi@redhat.com>

Author: caringi