nixos: Replace pkgs.openssh with config.programs.ssh.package

nixos/modules/virtualisation/ec2-data.nix

@@ -91,7 +91,7 @@ with lib;
             # can obtain it securely by parsing the output of
             # ec2-get-console-output.
             echo "-----BEGIN SSH HOST KEY FINGERPRINTS-----" > /dev/console
-            ${pkgs.openssh}/bin/ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub > /dev/console
+            ${config.programs.ssh.package}/bin/ssh-keygen -l -f /etc/ssh/ssh_host_dsa_key.pub > /dev/console
             echo "-----END SSH HOST KEY FINGERPRINTS-----" > /dev/console
           '';
         serviceConfig.Type = "oneshot";

nixos/modules/virtualisation/nova.nix

@@ -100,7 +100,7 @@ in
 
         # `openssl' is required to generate the CA.  `openssh' is
         # required to generate key pairs.
-        path = [ pkgs.openssl pkgs.openssh pkgs.bash ];
+        path = [ pkgs.openssl config.programs.ssh.package pkgs.bash ];
 
         respawn = false;