cgroup: don't set clone_children when it is already 1
cgroup: don't set clone_children when it is already 1

In particular, if it's already 1, and we can't change it, we currently
fail out.  That's silly.

I was going to just always continue, but if clone_children is not 1,
then the container *will* fail to start later on, so I'd rather stop
earlier on so the original cause doesn't get lost in the noise.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>
Acked-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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