Test case (added):
- Start a cluster with two storages
- Restart the whole cluster except one storage
- Allow recover from existing storage
- The admin crash when getting the new partition table because it doesn't
known the second (down) node.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1975 71dcc9de-d417-0410-9af5-da40c76e7ee4