Viewer: Treat ~/.ssh/id_ed25519 as a dflt priv key

... if the file exists and the SSHKey and SSHKeyFile parameters are not
specified.

Also move ~/.ssh/id_dsa to the bottom of the priority list, since it
implements a deprecated algorithm.

This emulates the behavior of OpenSSH.

java/com/turbovnc/rfb/Params.java

@@ -1128,9 +1128,10 @@ public void save(String node) {
   "IdentityFile OpenSSH configuration keyword, if a valid passphrase is not " +
   "supplied for the key\r " +
   "5. " + Utils.getHomeDir() + ".ssh/id_rsa, " + Utils.getHomeDir() +
-  ".ssh/id_dsa, and " + Utils.getHomeDir() + ".ssh/id_ecdsa (in that " +
-  "order), if this parameter, the SSHKey parameter, and the IdentityFile " +
-  "OpenSSH configuration keyword are not specified", null);
+  ".ssh/id_ecdsa, " + Utils.getHomeDir() + ".ssh/id_ed25519, and " +
+  Utils.getHomeDir() + ".ssh/id_dsa (in that order), if this parameter, the " +
+  "SSHKey parameter, and the IdentityFile OpenSSH configuration keyword are " +
+  "not specified", null);
 
   public StringParameter sshKeyPass =
   new StringParameter("SSHKeyPass", this, false, false,

java/com/turbovnc/vncviewer/Tunnel.java

@@ -218,8 +218,9 @@ protected static void createTunnelJSch(String host, Params params)
 
     if (useDefaultPrivateKeyFiles) {
       privateKeys.add(new File(homeDir + "/.ssh/id_rsa"));
-      privateKeys.add(new File(homeDir + "/.ssh/id_dsa"));
       privateKeys.add(new File(homeDir + "/.ssh/id_ecdsa"));
+      privateKeys.add(new File(homeDir + "/.ssh/id_ed25519"));
+      privateKeys.add(new File(homeDir + "/.ssh/id_dsa"));
     }
 
     for (Iterator<File> i = privateKeys.iterator(); i.hasNext();) {