openssh: 7.7p1 -> 7.9p1 (#48784)

added openssh_gssapi to make it easier to test the patched version

the HPN edition isn't available on top of 7.9p1 yet

fix-host-key-algorithms-plus.patch didn't apply anymore, assuming it's
fixed.

release notes: https://www.openssh.com/txt/release-7.9