<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_bgp_speaker_to_dragent(self, bgp_dragent, body):
 """Adds a BGP speaker to Dynamic Routing agent."""

        return self.post((self.agent_path + self.BGP_DRINSTANCES)
                         % bgp_dragent, body=body)