Comment 2 for bug 1847367

We discussed this in the Oct 17 nova meeting:

http://eavesdrop.openstack.org/meetings/nova/2019/nova.2019-10-17-14.00.log.html#l-239

And agreed on two things:

1. sean-k-mooney says the limit shouldn't be applied to vhost-user ports but that's a separate bug IMO which Sean can pursue.

2. We can add a [libvirt] group config option which defaults to None to let nova decide but allows for overriding the limit. Note that we wouldn't use a [workarounds] group option since it's not clear when we could remove the workaround option since we don't really enforce minimum versions of kernels in nova.

The change for #2 can be used to close *this* bug.