gunit: Update test 009 to match cgroup_set_values_recursive()

gunit: Update test 009 to match cgroup_set_values_recursive()

cgroup_set_values_recursive() had a parameter added to ignore
the dirty flag on write failures.  This is needed by
cgroup_modify_cgroup() as some writes may be expected to fail.

Update test 009 to utilize this new flag.  Note that
cgroup_set_values_recursive() is now being heavily tested by
the functional tests, so this unit test is no longer the primary
means of testing this function.

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>