We added an lvm filter for use when using Cinder's
LVM driver that would only scan devices that we have
actually deployed Cinder Volume Groups on.
This patch adds a simple output message to the setup
routine so we can more easily inspect what was found
and what has been set during devstack setup.
Change-Id: Iba5012caffd45dfb5143b6df954eed277445a60e
c3c94ca6bc