LU-8174 llite: restore fd_och when putting lease

LU-8174 llite: restore fd_och when putting lease

fd_och was not restored when putting back a file lease, preventing
from getting a lease, putting it back and taking it again on a FD.

Expand regression tests accordingly.

Signed-off-by: Henri Doreau <henri.doreau@cea.fr>
Change-Id: I1ad63c5332ee14bdac780f1d74794ac8827186cf
Reviewed-on: http://review.whamcloud.com/20331
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jean-Baptiste Riaux <riaux.jb@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>