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>
Maybe test_setup depends too much on env_process.
If we want to use it during our tests, it's not convenient. 
So I think drawing hugepages relative functions from test_setup is possible and useful.
We can call utils_hugepage.py in test_setup then.