Make 'gnt-node list-storage' use default storage type
Currently, when no explicit storage type is given, the
'gnt-node list-storage' command defaults to file storage
whether or not file storage is enabled on the cluster
or not. This patch fixes it by defaulting to the default
storage type (which is the storage type of the default
disk template). If this storage type does not support
space reporting, an error message is emitted.
Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>