LU-359 llite: no close error if application has known failure

LU-359 llite: no close error if application has known failure

Don't return error again when close if the application has known
former write failure.

Rename the per-inode based 'lli_write_rc' as per file-structure
based 'fd_last_write' to track the last write/fsync failure.
When 'sys_close()' is called against the 'file' structure,
we know whether the caller has already known former write/fsync
failure or not, then avoid potenical rdundant error handling,
like confused error message.

Miss to set 'lli_async_rc' if ll_writepage() failed.

Signed-off-by: Fan Yong <yong.fan@whamcloud.com>
Change-Id: I62d9cd83fc03fad22c994f2a77774ca113a6c057
Reviewed-on: http://review.whamcloud.com/1497
Tested-by: Hudson
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>