nixos/doc: add the new strongswan-swanctl service to the 18.09 release notes

Changed files
+16
nixos
doc
manual
release-notes
+16
nixos/doc/manual/release-notes/rl-1809.xml
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routing tables for instance.
</para>
</listitem>
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<listitem>
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<para>
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<varname>services.strongswan-swanctl</varname>
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is a modern replacement for <varname>services.strongswan</varname>.
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You can use either one of them to setup IPsec VPNs but not both at the same time.
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</para>
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<para>
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<varname>services.strongswan-swanctl</varname> uses the
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<link xlink:href="https://wiki.strongswan.org/projects/strongswan/wiki/swanctl">swanctl</link>
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command which uses the modern
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<link xlink:href="https://github.com/strongswan/strongswan/blob/master/src/libcharon/plugins/vici/README.md">vici</link>
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<emphasis>Versatile IKE Configuration Interface</emphasis>.
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The deprecated <literal>ipsec</literal> command used in <varname>services.strongswan</varname> is using the legacy
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<link xlink:href="https://github.com/strongswan/strongswan/blob/master/README_LEGACY.md">stroke configuration interface</link>.
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</para>
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</listitem>
</itemizedlist>
</section>