object: update instance numa object to handle pagesize

Work-item: Enhance libvirt driver to report available
           large pages per NUMA node in the host state data

Partial-Implement: blueprint virt-driver-large-pages
Change-Id: I392bdc45aa3b6b169c1d1bfdada624a16c77c91c
Merge "object: update instance numa object to handle pagesize"