LU-5971 llite: rename ccc_req to vvp_req

LU-5971 llite: rename ccc_req to vvp_req

Rename struct ccc_req to struct vvp_req and move related functions
from lustre/llite/lcommon_cl.c to the new file lustre/llite/vvp_req.c.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I6589cd1e039b41e55fcd833476f6a58ff2492900
Reviewed-on: http://review.whamcloud.com/13377
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>