Don't label or format disks for Ceph OSDs
Don't label or format disks for Ceph OSDs

Along with the changes from this https://github.com/Mirantis/fuel/pull/773
we no longer need to label Ceph disks. This removes superflous mkfs calls during
post-intallation and works around issues in ceph-deploy and ceph-disk.
Closes-Bug: #1246513

Change-Id: I91e6c253c164936c8b12798520cbd45587a36036

SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,koder-ua/nailgun-fcert,nebril/fuel-web,huntxu/fuel-web,nebril/fuel-web,koder-ua/nailgun-fcert,prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,stackforge/fuel-web,zhaochao/fuel-web,huntxu/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,zhaochao/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,eayunstack/fuel-web,stackforge/fuel-web,eayunstack/fuel-web,koder-ua/nailgun-fcert,SmartInfrastructures/fuel-web-dev,nebril/fuel-web,zhaochao/fuel-web,nebril/fuel-web,prmtl/fuel-web,nebril/fuel-web,koder-ua/nailgun-fcert,zhaochao/fuel-web,huntxu/fuel-web,zhaochao/fuel-web,huntxu/fuel-web,prmtl/fuel-web