A config option is being added in nova with [1]
in order to allow configuring lower tb-cache size
for qemu guest VMs.
This patch adds a flag in devstack so jobs can
utilize it to set required tb-cache size.
[1] https://review.opendev.org/c/openstack/nova/+/868419
Co-Authored-By: Sean Mooney <work@seanmooney.info>
Related: blueprint libvirt-tb-cache-size
Change-Id: Ifde737eb5d87dfe860445097d1f2b0ce16b0de05
yatinkarel
c707dd3fc2