LU-541 Fix liblustreapi.c usage of errno and rc.

LU-541 Fix liblustreapi.c usage of errno and rc.

* fix liblustreapi.c usage of errno and rc, llapi_xxx() functions should
  return negative value on error.
* enable sanity subtest 65.

Change-Id: I30d172c49b60f6f77ea57c3082d0c68f4c141dea
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1155
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: hongchao.zhang <hongchao.zhang@whamcloud.com>
Tested-by: hongchao.zhang <hongchao.zhang@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>