cr-dump: discover fs type in fill_fd_params_special

FS type is required to distinguish between local files and remove ones, which
will be restored via SPFS and thus has to be created first.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>