Partition preservation scope for RF
Partition preservation scope for RF

Cover reinstall procedure for Reduced Footprint feaure:

1) fuel node --node 1 --disk --download
2) edit disk.yaml (set keep_data to true)
3) fuel node --node 1 --disk --upload
4) provision virt node
5) spawn vms (fuel2 env spawn-vms <env-id>)
6) wait for VMs to comes up
7) deploy virt node

Change-Id: I0c00000453d16d14c28d10f87d066d9890181db0
Closes-Bug: #1505147

stackforge/fuel-docs,stackforge/fuel-docs