libcgroup: create function for cgroup_delete_cgroup

libcgroup: create function for cgroup_delete_cgroup

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

This patch creates the function test_cgroup_delete_cgroup(), to delete a
group in fs, and this way eliminates lot of redundant code. This patch
however may mesh up the numbering of testcases, which will be cleaned up
in a later patch once the functions are created for all other apis too.

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@287 4f4bb910-9a46-0410-90c8-c897d4f1cd53