doc: revert primary-backup-2.6.29-and-higher.sh script

This patch reverts primary-backup-2.6.29-and-higher.sh. This script
is not safe for production enviroments until the commit phase
guarantees that the state-change propagation over netlink is
reliable. This script should be ready for 2.6.30 if the appropriate
kernel patches go into mainline in time.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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