Comment 0 for bug 1940790

# 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 commit which 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