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Merge the binary package into the main iptables package now that compat tools
are the main ones.

While at it, move all binaries to /usr/sbin/ instead of /sbin. No reason for
them to live there.

TODO:
 * actual tests for symlinking issues
 * adjust manpages
 * check update-alternatives
 * check relationships
 * check READMEs etc
 * wrap-and-sort
Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>

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>