cputest_regression_test: skip on cgroup v2

The v2 cpuset controller purposely exposes minimal functionality in
order to avoid feature creep that plagued the v1. Because of that there
is no point in attempting to run the cpuset_exclusive tests on v2.

commit 4ec22e9c5a90e3809dd52014d5d239af8831a520
Author: Waiman Long <[email protected]>
Date:   Thu Nov 8 10:08:35 2018 -0500

...

    The cpuset controller had experienced feature creep since its
    introduction more than a decade ago. Besides the core cpus and mems
    control files to limit cpus and memory nodes, there are a bunch of
    additional features that can be controlled from the userspace. Some of
    the features are of doubtful usefulness and may not be actively used.
...

Fixes #1028

Signed-off-by: Sowmya Indranna <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>

Author: Sowmya-TI

testcases/kernel/controllers/cpuset/cpuset_regression_test.sh

@@ -130,6 +130,11 @@ setup()
 
 	tst_res TINFO "test starts with cgroup version $cgroup_version"
 
+	if [ "$cgroup_version" = "2" ]; then
+		tst_brk TCONF "cgroup v2 found, skipping test"
+		return
+	fi
+
 	if ! [ -f ${root_cpuset_dir}/${cpu_exclusive} ]; then
 		cpu_exclusive=cpu_exclusive
 		cpus=cpus