Add installation steps for Ceph one-node cluster

Add steps to install Ceph one-node cluster over virtlet
installation to be able to test Ceph related virtlet features.

Change-Id: Ic9e531a69fcb52d7360fcf089312fa1913350e0b
Reviewed-on: https://review.gerrithub.io/362388
Reviewed-by: Tatyanka Leontovich <tleontovich@mirantis.com>
Tested-by: Tatyanka Leontovich <tleontovich@mirantis.com>
7 files changed