waitpid at abort to make sure we can rmdir cgroups
waitpid at abort to make sure we can rmdir cgroups

If we abort the container start, and don't wait for the init task to be
reaped after we kill it, then we can't remove the container cgroup
because it is not empty.

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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