Optimize the priority of the ssh authentication methods

[windvalley]

Now, there are three authentication methods: password, pubkey, ssh-agent.
If the 3 auth methods are all valid, the current priority order is password > pubkey > ssh-agent.
But I think a more reasonable order should be: ssh-agent > pubkey > password. The next gossh version will adjust the order to this.

Tips:
You can observe the actual authentication method used from the /var/log/secure file of the target host.

tail -f /var/log/secure