cgroup: treat memory.oom_control specially too
cgroup: treat memory.oom_control specially too

Similar to f444f7fac40, we need to treat memory.oom_control as a "special"
property and try not to write its default value, since in the 3.11 kernel
it can't be written when memory.use_heirarchy is true, which is the
default.

CC: Andrei Vagin <74c05afa918858348d6db8037d82fa8124870113@virtuozzo.com>
Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote,KKoukiou/criu-remote