LU-1773 lov: lov_delete_raid0() need heed lov_fini_raid0()

LU-1773 lov: lov_delete_raid0() need heed lov_fini_raid0()

Add a sanity test case and handle failure of lov_init_raid0()
correctly.

LU-1480 is also due to the failure of lov_init_raid0().

Signed-off-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: If900cb854846f778c74d0368d64cb7a9d5189406
Reviewed-on: http://review.whamcloud.com/3732
Tested-by: Hudson
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>