libcgroup Test: libcgrouptest-multimnt03

libcgroup Test: libcgrouptest-multimnt03

This patch adds a testcase for libcgroup API cgroup_attach_task() testing.
The API is called under the multimount condition(FS_MOUNTED=2) and return
values are checked. The argument of the api is a valid group under one
controller's(say cpu) mountpoint. This group exist only under one
controller(cpu). So the attached task is checked under this group for this(cpu)
controller and under the root group for the other(memory) controller.
In the second call the argument is a group under other controller(memory)
and hence now task is checked under the two groups of both controllers.
In the third calll we give the argument as a non existing group, so the
return value should be ECGROUPNOTEXIST.

Signed-off-by: Sudhir Kumar <skumar@linux.vnet.ibm.com>
git-svn-id: https://libcg.svn.sourceforge.net/svnroot/libcg/trunk@243 4f4bb910-9a46-0410-90c8-c897d4f1cd53