Updated openstack/openstack
Project: openstack/cinder  de4ae8b0d74a6af0753a13078c922f0158130805

Correct lvm_mirrors help message

The description is not correct if someone sets
lvm_mirrors=0.  Also clarify LVs vs. lvms.

Change-Id: I7ec74fc8beaef5e638bc1a5dac3d7d97f1c474d3