Revert "openssh: 6.9p1 -> 7.0p1"

This reverts commit a8eb2a6a81524f3be0c8886f6d06090b50b0a513. OpenSSH
7.0 is causing too many interoperability problems so soon before the
15.08 release.

For instance, it causes NixOps EC2 initial deployments to fail with
"REMOTE HOST IDENTIFICATION HAS CHANGED". This is because the client
knows the server's ssh-dss host key, but this key is no longer
accepted by default. Setting "HostKeyAlgorithms" to "+ssh-dss" does
not work because it causes ssh-dss to be ordered after
"ecdsa-sha2-nistp521", which the server also offers. (Normally, ssh
prioritizes host key algorithms for which the client has a known host
key, but not if you set HostKeyAlgorithms.)

nixos/modules/programs/ssh.nix

···
 
         ForwardX11 ${if cfg.forwardX11 then "yes" else "no"}
 
-        # Allow DSA keys for now. (These were deprecated in OpenSSH 7.0.)
-        PubkeyAcceptedKeyTypes +ssh-dss
-
         ${cfg.extraConfig}
       '';
 

nixos/modules/services/networking/ssh/sshd.nix

···
         ${flip concatMapStrings cfg.hostKeys (k: ''
           HostKey ${k.path}
         '')}
-
-        # Allow DSA keys for now. (These were deprecated in OpenSSH 7.0.)
-        PubkeyAcceptedKeyTypes +ssh-dss
       '';
 
     assertions = [{ assertion = if cfg.forwardX11 then cfgc.setXAuthLocation else true;

pkgs/tools/networking/openssh/default.nix

···
 in
 with stdenv.lib;
 stdenv.mkDerivation rec {
-  name = "openssh-7.0p1";
+  name = "openssh-6.9p1";
 
   src = fetchurl {
     url = "mirror://openbsd/OpenSSH/portable/${name}.tar.gz";
-    sha256 = "1rc52jyc5v5b8j9kvasrnz9vnj9b0i7fw4nqac8wix0r794k4ngx";
+    sha256 = "1zkci5nbpb4frmzj2vr3kv9j47x2h72kvybcpr0d8mzk73sls1vf";
   };
 
   prePatch = optionalString hpnSupport