oslo.cache options are missing from neutron.conf generated by "tox -e genconfig"

[Takashi Kajinami]

# We could include this in bug 1940009 but the fix for the bug was already merged.
# So I'll crate a separate bug to avoid two Closes-Bug commits which I believe is confusing.

Neutron uses oslo.cache library for caching and registers its options.
However these options are missing from neutron.conf generated by "tox -e genconfig".

[1] https://github.com/openstack/neutron/blob/84d9bb1e0e5cde34acd9f4ee7f54baf9c89c7d81/neutron/common/cache_utils.py#L28-L30

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/neutron/+/805547

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/neutron/+/805547
Committed: https://opendev.org/openstack/neutron/commit/d6b1dd4a9396d011b2f5fea5bbea4daf3614f7c5
Submitter: "Zuul (22348)"
Branch: master

commit d6b1dd4a9396d011b2f5fea5bbea4daf3614f7c5
Author: Takashi Kajinami <email address hidden>
Date: Mon Aug 23 11:51:31 2021 +0900

    Include oslo.cache options in neutron.conf

    Neutorn uses oslo.cache library for caching. This change ensures that
    options of the library are included in neutron.conf generated by
    oslo-config-generator.
    This change also removes cache_utils module from neutron.opts because
    the module is not used in that file.

    Closes-Bug: #1940790
    Change-Id: I9ccd145d5ea1a1e0033eb43b609cc6428ea95f23

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 19.0.0.0rc1 release candidate.