fix occasional 401 error

[x893675]

What type of PR is this?

/kind bug

What this PR does / why we need it:

在 metadata 中使用 generatename, 会偶现重复创建的情况。

当 etcd 中存在两个同样 token 的对象，之前的代码逻辑会报错

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Does this PR introduced a user-facing change?

Fix occasional 401 error

Additional documentation, usage docs, etc.:

[x893675]

/cc @lixd

[codecov-commenter]

Codecov Report

Merging #552 (76e7af0) into release-1.3 (d014da8) will decrease coverage by 0.02%.
The diff coverage is 12.50%.

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@@               Coverage Diff               @@
##           release-1.3     #552      +/-   ##
===============================================
- Coverage        12.17%   12.16%   -0.02%     
===============================================
  Files              110      111       +1     
  Lines            16980    16993      +13     
===============================================
- Hits              2068     2067       -1     
- Misses           14665    14679      +14     
  Partials           247      247              

Impacted Files	Coverage Δ
pkg/utils/random/string.go	0.00% <0.00%> (ø)
pkg/authentication/auth/token.go	61.29% <100.00%> (-0.31%)	⬇️

[lixd]

/lgtm

[kubeclipper-bot]

LGTM label has been added.

Git tree hash: 6c7190e47cd7963387f0d581d2149a11f7bc85f9

[kubeclipper-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lixd, x893675

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[x893675]

/cherrypick master

[kubeclipper-bot]

@x893675: new pull request created: #553

In response to this:

/cherrypick master

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