SSH tunnel preferred auth option added

docs/todo.txt

 Major:
 
-S/DB selector combo works as crap
-Multiple tabs - tab removed after execute
+error: S/DB selector combo works as crap
 SOCKS proxy, HTTP proxy
 
 1. Browse data by foreign keys

plugins/org.jkiss.dbeaver.core/src/org/jkiss/dbeaver/model/net/ssh/SSHTunnelImpl.java

@@ -119,6 +119,8 @@ public class SSHTunnelImpl implements DBWTunnel {
 
             session = jsch.getSession(sshUser, sshHost, sshPortNum);
             session.setConfig("StrictHostKeyChecking", "no");
+            session.setConfig("PreferredAuthentications",
+                    privKeyFile != null ? "publickey" : "password");
             session.setUserInfo(ui);
             session.connect();
             try {