pfSense/pfsense 13980a4src/etc/inc vpn.inc ipsec.inc

Add IPsec DH/PFS groups 25/26/27. Implements #9757

(cherry picked from commit 21bee0287caf76bb7ab63ec29b0ecf7435940a06)
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+9-0src/etc/inc/vpn.inc
+6-0src/etc/inc/ipsec.inc
+15-02 files

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