LU-6074 doc: synchronize clio.txt with current implementation

LU-6074 doc: synchronize clio.txt with current implementation

Obsoleted stuff has been deleted in this patch, and changes to
current CLIO implementation has been updated.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I55b137ff0df527c50f96148e4418394d4fcbfd38
Reviewed-on: http://review.whamcloud.com/13335
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>