Add bufferchain for HTTP2 stream

[peacocktrain]

Bufferchain is added for http2 stream and Iobuffer is implemented

[codecov-io]

Codecov Report

Merging #23 (ea09cb0) into master (327992a) will increase coverage by 0.65%. The diff coverage is 50.87%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
+ Coverage   63.00%   63.65%   +0.65%     
==========================================
  Files          17       18       +1     
  Lines         819      908      +89     
==========================================
+ Hits          516      578      +62     
- Misses        248      276      +28     
+ Partials       55       54       -1     

Impacted Files	Coverage Δ
buffer/bufferchain.go	50.87% <50.87%> (ø)
buffer/iobuffer.go	76.15% <0.00%> (-0.32%)	:arrow_down:
log/errorlog.go	55.00% <0.00%> (ø)
log/logger.go	51.81% <0.00%> (+1.33%)	:arrow_up:
log/roller.go	78.49% <0.00%> (+8.75%)	:arrow_up:
utils/goroutine.go	92.30% <0.00%> (+23.07%)	:arrow_up:

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[cch123]

please fix the golang-ci lint warnings~

这个 PR 的背景和上下文是啥？

[nejisama]

1. 我看改动并没有更新依赖的地方，为什么更新了那么多依赖
2. golint的报错都需要处理一下

[nejisama]

看了下是引入testify 导致的，pkg这个库 希望尽可能少的依赖，避免别的库引用的时候依赖过多，建议修改掉

[nejisama]

这个月不处理完，这个PR就关闭了哈

[peacocktrain]

这个PR 是为 http2 流式请求建立一个 bufferchain，downstream的buffer在这个队列中直接送到upstream消费

[peacocktrain]

这个pr能过，再更新修改mosnhttp2流式的哪个pr

[nejisama]

我看把vendor代码改了，但是go.sum没有改，应该不是正常的改动方式

[nejisama]

请按照标准流程来处理go.mod相关的文件

[peacocktrain]

请按照标准流程来处理go.mod相关的文件

go.sum 已回退