cgroup/cpuset: Extend test_cpuset_prs.sh to test remote partition

This patch extends the test_cpuset_prs.sh test script to support testing
the new remote partition type and the new "cpuset.cpus.exclusive" and
"cpuset.cpus.exclusive.effective" control files by adding new tests
for them. In addition, the following changes are also made:

 1) Run the state transition tests directly under root to ease testing
    of remote partition and remove the unneeded test column.
 2) Add a column to for the list of expected isolated CPUs and compare
    it with the actual value by looking at the state of
    /sys/kernel/debug/sched/domains which will be available if the
    verbose flag is set.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>