In the future there will be several test cases in cgroup_test

1.test.cfg can desire which test case you want to run.
2.Defaultly test.cfg contains all the testcases, you  can modify its detail to run different case.
3.test-example.cfg contains all the testcases, you  can get every testcase name.

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>