Run zsh command to unify the environment

def zsh_mode(self, delay_factor=1, prompt_terminator="$"):
        """Run zsh command to unify the environment"""
        delay_factor = self.select_delay_factor(delay_factor)
        self.clear_buffer()
        command = self.RETURN + "zsh" + self.RETURN
        self.write_channel(command)
        time.sleep(1 * delay_factor)
        self.set_prompt()
        self.clear_buffer()