Comment 35 for bug 1578036

Made some typos in my above response to Jason, 1st paragraph should read as,

"PDB clearly shows this is not related to version of export-diff/import-diff. The ceph.py is trying to export-diff a snapshot made against the original ceph volume, but backup manager.py passes a cloned temp volume to ceph.py for snapshot creation. Hence export-diff, being executed, can't find the actual snapshot against the original ceph volume."