From: Sudhir Kumar <skumar@linux.vnet.ibm.com>

From: Sudhir Kumar <skumar@linux.vnet.ibm.com>

libcgroup: libcgroup testcases for cgroup_attach_task()

This patch adds 3 testcases for libcgroup API cgroup_attach_task() testing. The API
is called under  the same but two conditions(FS_MOUNTED=0/1) and return
values are checked. For FS_MOUNTED=1 the API is first called without
intializing ie without calling cgroup_init(), and then after cg_init(). Each time
the null cgroup is passed. The task is checked if it exists under the root
group's tasks file.
The 4th testcase calls cgroup_attach_task_pid() with an invalid pid.

Testcases for FS_MOUNTED=2 have to be added.

Signed-off-by: Sudhir Kumar <skumar@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
git-svn-id: https://libcg.svn.sourceforge.net/svnroot/libcg/trunk@89 4f4bb910-9a46-0410-90c8-c897d4f1cd53