code: func (c *RPCClient) ForceLeave(node string) error {
  	header := requestHeader{
  		Command: forceLeaveCommand,
  		Seq:     c.getSeq(),
  	}
  	req := forceLeaveRequest{
  		Node: node,
  	}
  	return c.genericRPC(&header, &req, nil)
  }
docs: // ForceLeave is used to ask the agent to issue a leave command for
  // a given node