'Establish the secure copy connection.'

def establish_scp_conn(self):

    ssh_connect_params = self.ssh_ctl_chan._connect_params_dict()
    self.scp_conn = self.ssh_ctl_chan._build_ssh_client()
    self.scp_conn.connect(**ssh_connect_params)
    self.scp_client = scp.SCPClient(self.scp_conn.get_transport())
