This patch use the previously constructed domain numa-layout info to
setup the domain memory. The domain vcpus are pinned according to
allocation strategy in the following way :
- CONFINE : all vcpus are pinned to the node cpus
- STRIPE : all vcpus are pinned to the logical-or of the subset of node cpus
- SPLIT : vcpus are pinned to the node from which the vnode is allocated

Also, in case of SPLIT, the domain is made aware of the virtual NUMA
enlightenment through a flag in xen_start_info (SIF_NUMA_DOMAIN).

-dulloor

Signed-off-by: Dulloor Rao <dulloor@gatech.edu>