chore: Remove dependency on io/ioutil package

[simlecode]

关联的Issues (Related Issues)

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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.
• 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

[codecov-commenter]

Codecov Report

Merging #355 (b756ed0) into master (34a7277) will decrease coverage by 0.02%.
The diff coverage is 33.33%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #355      +/-   ##
==========================================
- Coverage   20.81%   20.80%   -0.02%     
==========================================
  Files         190      190              
  Lines       23086    23086              
==========================================
- Hits         4806     4802       -4     
- Misses      17501    17504       +3     
- Partials      779      780       +1     

Flag	Coverage Δ
unittests	20.80% <33.33%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cli/storage-deals.go	3.91% <0.00%> (ø)
cli/util.go	3.90% <0.00%> (ø)
rpc/rpc.go	0.00% <0.00%> (ø)
config/save.go	36.00% <50.00%> (ø)
client/import.go	49.52% <100.00%> (ø)
piecestorage/filestore.go	47.00% <100.00%> (ø)
piecestorage/memstore.go	70.42% <100.00%> (ø)

... and 1 file with indirect coverage changes

[hunjixin]

LGTM