Check if at shell prompt root@ and go into CLI.

def enter_cli_mode(self):
        """Check if at shell prompt root@ and go into CLI."""
        delay_factor = self.select_delay_factor(delay_factor=0)
        count = 0
        cur_prompt = ""
        while count < 50:
            self.write_channel(self.RETURN)
            time.sleep(0.1 * delay_factor)
            cur_prompt = self.read_channel()
            if re.search(r"admin@", cur_prompt) or re.search(
                r"^\$$", cur_prompt.strip()
            ):
                self.write_channel("cli" + self.RETURN)
                time.sleep(0.3 * delay_factor)
                self.clear_buffer()
                break
            elif ">" in cur_prompt or "%" in cur_prompt:
                break
            count += 1