Cleanup: use verb %w with fmt.Errorf() when generate new wrapped error from error

[zhaodiaoer]

What type of PR is this?

/kind good-first-issue

What this PR does / why we need it:

Please read https://github.com/golang/go/wiki/ErrorValueFAQ
After go1.13, it is best to use %w in fmt.Errorf() when generate a new wrapped error from error,
and use errors.Is() or errors.As() when compare between error instance

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

None

other Note

None

[openyurt-bot]

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In response to this:

What type of PR is this?

/kind good-first-issue

What this PR does / why we need it:

Please read https://github.com/golang/go/wiki/ErrorValueFAQ
After go1.13, it is best to use %w in fmt.Errorf() when generate a new wrapped error from error,
and use errors.Is() or errors.As() when compare between error instance

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

None

Does this PR introduce a user-facing change?

None

other Note

None

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[openyurt-bot]

Welcome @zhaodiaoer! It looks like this is your first PR to openyurtio/openyurt 🎉

[rambohe-ch]

@zhaodiaoer Thanks for raising pull request. please fix comment and unit test errors.

[zhaodiaoer]

@rambohe-ch Thanks, i have fixed all the buggy usage related to io.EOF and have successfully run the unit tests.

[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, zhaodiaoer

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