Correct missing vcpupin elements for numa case

We should pin each vcpu into specified numa's cpuset. But the current
code only pin the last vcpu in one cell to specified numa's cpuset.

Change-Id: Ia1cda5e117d7e569e8891bd7c3d03bd6148a0c27
Closes-Bug: #1374902
Merge "Correct missing vcpupin elements for numa case"