tests: cgroup04 needs "full" cgroup mode

Because we're doing this on the same host, the cgroups will already exist.
We need to write the properties in full mode to exercise these cases.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

test/zdtm/static/cgroup04.desc

-{'flavor': 'h', 'flags': 'suid', 'opts': '--manage-cgroups'}
+{'flavor': 'h', 'flags': 'suid', 'opts': '--manage-cgroups=full'}