remove MinPeerThreshold in bootstrap config because it is not used /删除MinPeerThreshold字段从bootstrap配置，没有用到

[elvin-du]

关联的Issues (Related Issues)

close

改动 (Proposed Changes)

附注 (Additional Info)

自查清单 (Checklist)

在你认为本 PR 满足被审阅的标准之前，需要确保 / Before you mark the PR ready for review, please make sure that:

• 符合Venus项目管理规范中关于PR的相关标准 / The PR follows the PR standards set out in the Venus project management guidelines
• 具有清晰明确的commit message / All commits have a clear commit message.
• 包含相关的的测试用例或者不需要新增测试用例 / This PR has tests for new functionality or change in behaviour or not need to add new tests.
• 存在兼容性问题（接口, 配置，数据，灰度），如果存在需要进行文档说明 / This PR has compatibility issues (API, Configuration, Data, GrayRelease), if so, need to be documented.
• 包含相关的的指南以及文档或者不需要新增文档 / This PR has updated usage guidelines and documentation or not need
• 通过必要的检查项 / All checks are green

[simlecode]

@elvin-du ci 没过

[codecov-commenter]

Codecov Report

Merging #6063 (97b04d5) into master (d4b62f6) will increase coverage by 0%.
Report is 22 commits behind head on master.
The diff coverage is 84%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #6063    +/-   ##
=======================================
  Coverage      24%     24%            
=======================================
  Files         661     662     +1     
  Lines       80244   80352   +108     
=======================================
+ Hits        19646   19677    +31     
- Misses      57998   58064    +66     
- Partials     2600    2611    +11     

[simlecode]

lgtm