修正HTTP Early Answer功能在HTTP头部带有Body时的引发assert的问题。

* 原实现无法正确处理HTTP请求带有Body时，业务层执行Early Answer动作；
* 现修正为HTTP请求头完整时，检查是否需要Early-Answer。如果请求已经向真实服务器转发，则不执行Early-Answer动作。

plugin/protocol/http/src/http_half.cpp

@@ -871,7 +871,6 @@ void hs_ops_response_set(struct tfe_http_session * session, struct tfe_http_half
 			hf_in_req_private->user_stream_action = ACTION_DROP_DATA;
 			hf_in_req_private->is_user_stream_action_set = true;
 		}
-		else assert(0);
 	}
 
 	/* Call at response's callback, replace incoming response */
@@ -882,7 +881,6 @@ void hs_ops_response_set(struct tfe_http_session * session, struct tfe_http_half
 			hf_in_resp_private->user_stream_action = ACTION_DROP_DATA;
 			hf_in_resp_private->is_user_stream_action_set = true;
 		}
-		else assert(0);
 	}
 
 	assert(hs_private->hf_private_resp_user == NULL);