Prepare for Paramiko SSH connection.

def _build_ssh_client(self):
        """Prepare for Paramiko SSH connection."""
        # Create instance of SSHClient object
        remote_conn_pre = paramiko.SSHClient()

        # Load host_keys for better SSH security
        if self.system_host_keys:
            remote_conn_pre.load_system_host_keys()
        if self.alt_host_keys and path.isfile(self.alt_key_file):
            remote_conn_pre.load_host_keys(self.alt_key_file)

        # Default is to automatically add untrusted hosts (make sure appropriate for your env)
        remote_conn_pre.set_missing_host_key_policy(self.key_policy)
        return remote_conn_pre