add ed25519 host key type; add AuthenticationMethods option

pillar.example

@@ -5,6 +5,7 @@ sshd_config:
     - /etc/ssh/ssh_host_rsa_key
     - /etc/ssh/ssh_host_dsa_key
     - /etc/ssh/ssh_host_ecdsa_key
+    - /etc/ssh/ssh_host_ed25519_key
   UsePrivilegeSeparation: 'yes'
   KeyRegenerationInterval: 3600
   ServerKeyBits: 768
@@ -21,6 +22,7 @@ sshd_config:
   HostbasedAuthentication: 'no'
   PermitEmptyPasswords: 'no'
   ChallengeResponseAuthentication: 'no'
+  AuthenticationMethods 'publickey,keyboard-interactive'
   X11Forwarding: 'yes'
   X11DisplayOffset: 10
   PrintMotd: 'no'