In all kernels, memory.use_hierarchy must be written before there are child
cgroups. In 3.11, memory.swappiness must be written before there are child
cgroups, so let's consider it a "special" property for all kernels.
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
CC: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>