Configure LVM filter to only allow cinder device
Configure LVM filter to only allow cinder device

This patch changes /etc/lvm/lvm.conf to allow only the device used
for cinder and to reject all other devices, as suggested in the
install-guide.

Change-Id: Ia00b2ef3727ba263ea2ce1645b494adc6dd25fef

openstack/training-labs,openstack/training-labs,openstack/training-labs