Add a utils for hugepages test.

During the hugepage test, we need to set the transparent hugepage, get the
transparent hugepage state, prepare a c file for test.
This utils contain those funcitons.

Signed-off-by: Weiqing Wang <wangwq.fnst@cn.fujitsu.com>
I'd prefer put this function into libvirt_xml.vmxml or utils_test.libvirt module.