Update cinder.conf

This is mostly just a sanity check, we're revmoving
this whole check from the gate, but we've had
conflicting versions of the truth here and I'm trying
to figure out why.

This patch is a fresh run of generate_sample, which differs
from https://review.openstack.org/#/c/96784/

Change-Id: Ia2d6ca01beb1d2c42084100990129dadbb32b22c