move cpuset01 to stress runtest

This reproducer takes significant time, it runs for 1 hour,
which is ~1/3 of time spent by all mm testcases. Move it to
stress runtest.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
Acked-by: Caspar Zhang <caspar@casparzhang.com>