LU-5823 clio: add coo_obd_info_get and coo_data_version

LU-5823 clio: add coo_obd_info_get and coo_data_version

* Add coo_obd_info_get to retrieve object attributes from servers.
* Add coo_data_version to retrieve object's data_version.

Signed-off-by: Bobi Jam <bobijam.xu@intel.com>
Change-Id: Ia66a3ba1eee5c6478f3aa5c9f942ada77b2b5fe9
Reviewed-on: http://review.whamcloud.com/12638
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>