ci: host tuning in devstack

[EmilienM]

What this PR does / why we need it:

Copy host tuning from:
https://opendev.org/openstack/devstack/src/commit/05f7d302cfa2da73b2887afcde92ef65b1001194/.zuul.yaml#L645-L662

Enable ENABLE_SYSCTL_MEM_TUNING, ENABLE_SYSCTL_NET_TUNING and
ENABLE_ZSWAP for the reasons explained in comments.

Release note:

NONE

[EmilienM]

/cherry-pick release-1.31

[k8s-infra-cherrypick-robot]

@EmilienM: once the present PR merges, I will cherry-pick it on top of release-1.31 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.31

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[kayrus]

/test openstack-cloud-csi-cinder-e2e-test
/test openstack-cloud-csi-manila-e2e-test

[zetaab]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zetaab

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [zetaab]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[kayrus]

@EmilienM well, it takes 1h30m for cinder. let's give it a try and retest the #2742

[kayrus]

/lgtm

[k8s-infra-cherrypick-robot]

@EmilienM: new pull request created: #2748

In response to this:

/cherry-pick release-1.31

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.