1.删除缓存测试无效代码

2.修改header链表结构为TQ
3,重构h2_half_ops_field_read，h2_half_ops_field_write等接口

plugin/protocol/http2/src/http2_common.cpp

@@ -72,7 +72,7 @@ str_to_val_idx(const char *val, const struct value_string *vs)
             i++;
         }
     }
-    return -1;
+    return 0;
 }
 
 const char*
@@ -257,7 +257,7 @@ int deflate_init(struct z_stream_st **strm, int gzip)
 	return ret;
 }
 
-int defalta_br_write(struct z_stream_st **strm,
+int deflate_br_write(struct z_stream_st **strm,
     				 const unsigned char * source, size_t slen,
     				 struct evbuffer * evbuf, int end)
 {
@@ -363,7 +363,7 @@ int deflate_write(struct z_stream_st **strm, const uint8_t *source,
 		ret = defalta_gzip_write(strm, source, slen, evbuf, end);
 	}
 	if (gzip == HTTP2_CONTENT_ENCODING_BR){
-		ret = defalta_br_write(strm, source, slen, evbuf, end);
+		ret = deflate_br_write(strm, source, slen, evbuf, end);
 	}
 
 	return ret;