cgroup_test: Add cpu high load test for cpu,cpuset system

1.Modify /etc/cgconfig.conf file to create 2 cgroups.
2.Execute a shell script on desired cpuset.cpus and cpuset.mems
  in each cgroup with different cpu.shares.
3.Compare 2 tasks' cpu rate.

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>