Add IPsec DH/PFS groups 25/26/27. Implements #9757
(cherry picked from commit 21bee0287caf76bb7ab63ec29b0ecf7435940a06)
Add IPsec DH/PFS groups 25/26/27. Implements #9757
(cherry picked from commit 21bee0287caf76bb7ab63ec29b0ecf7435940a06)