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>
Agree that we can put some basic function about hugepages and transparent hugepages to framework. But seem these ops are to host so maybe utils_misc.py or staging/utils_memory.py are better choice. And we can call them in test_setup.py.