LU-2675 llite: remove lli_lvb

LU-2675 llite: remove lli_lvb

In struct ll_inode_info remove the struct ost_lvb lli_lvb member and
replace it with obd_time lli_{a,m,c}time. Rename ll_merge_lvb() to
ll_merge_attr(). Remove cl_merge_lvb() and replace calls to it with
calls to ll_merge_attr().

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Idaf8a89d2e4243e62a23cab949c3c129001bb9f3
Reviewed-on: http://review.whamcloud.com/12849
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>