Related: https://github.com/checkpoint-restore/criu/issues/577

Restoring a runc container which is running in the host's network
namespace locked the network (iptables-restore) without unlocking it.

This disables network logging if running in the host's network
namespace.
Suggested-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>