Docs: nobarrier mount option should be removed

[Yuki Hirano]

The following documentation recommends using the `nobarrier` mount option for xfs.

https://docs.openstack.org/openstack-ansible-os_swift/2023.2/configure-swift-devices.html

But the nobarrier option is removed from Linux v4.19 [1], and yields mount failures if specified. All supported operating systems of the openstack-ansible[2] uses Linux v5.x, so we should remove the `nobarrier` mount option from docs.

[1]: xfs(5) on Ubuntu 22.04. https://manpages.ubuntu.com/manpages/jammy/en/man5/xfs.5.html
[2]: https://docs.openstack.org/openstack-ansible/2023.2/admin/upgrades/compatibility-matrix.html

[Tim Burke (1-tim-z)]

Swift removed nobarrier from its docs back in 2019: https://review.opendev.org/c/openstack/swift/+/665984

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/openstack-ansible-os_swift/+/909233

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/openstack-ansible-os_swift/+/909233
Committed: https://opendev.org/openstack/openstack-ansible-os_swift/commit/719f8437f47756bba4baa448e35b462aef3face3
Submitter: "Zuul (22348)"
Branch: master

commit 719f8437f47756bba4baa448e35b462aef3face3
Author: Tim Burke <email address hidden>
Date: Fri Feb 16 09:52:16 2024 -0800

    Remove nobarrier mount option from docs

    Swift stopped including this option in its docs in 2019, and recent
    kernels stopped recognizing it as a valid option, leading to mount
    failures.

    Related-Change: https://review.opendev.org/c/openstack/swift/+/665984
    Closes-Bug: #2051764
    Change-Id: I4f2ff43ac90023db422633246e89146b377cee74