Disable default LVM backend for Cinder
Disable default LVM backend for Cinder

LVM backend is a default option for Cinder. If user
choose Ceph, LVM should be turned-off and disabled.

Change-Id: I3e7d081a0081e6cb5036052ad5c324c815b2a25f
Closes-Bug: #1525984

huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,stackforge/fuel-web,eayunstack/fuel-web,stackforge/fuel-web,huntxu/fuel-web,stackforge/fuel-web