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Now the old iptables binary is server at /sbin/iptables-legacy.
Then, using the update-alternatives system one can choose which binary is going
to provide the actual /sbin/iptables tool, either iptables-legacy or
the newer iptables-compat (nf_tables compat).

The compat version is given more priority by default.
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>