Load the user's previously-saved kernel connection settings.

def load_connection_settings(self):
        """Load the user's previously-saved kernel connection settings."""
        existing_kernel = CONF.get("existing-kernel", "settings", {})

        connection_file_path = existing_kernel.get("json_file_path", "")
        is_remote = existing_kernel.get("is_remote", False)
        username = existing_kernel.get("username", "")
        hostname = existing_kernel.get("hostname", "")
        port = str(existing_kernel.get("port", 22))
        is_ssh_kf = existing_kernel.get("is_ssh_keyfile", False)
        ssh_kf = existing_kernel.get("ssh_key_file_path", "")

        if connection_file_path != "":
            self.cf.setText(connection_file_path)
        if username != "":
            self.un.setText(username)
        if hostname != "":
            self.hn.setText(hostname)
        if ssh_kf != "":
            self.kf.setText(ssh_kf)
        self.rm_group.setChecked(is_remote)
        self.pn.setText(port)
        self.kf_radio.setChecked(is_ssh_kf)
        self.pw_radio.setChecked(not is_ssh_kf)

        try:
            import keyring
            ssh_passphrase = keyring.get_password("spyder_remote_kernel",
                                                  "ssh_key_passphrase")
            ssh_password = keyring.get_password("spyder_remote_kernel",
                                                "ssh_password")
            if ssh_passphrase:
                self.kfp.setText(ssh_passphrase)
            if ssh_password:
                self.pw.setText(ssh_password)
        except Exception:
            pass