Fix internal/worker testing fail

[kevindiu]

Description:

This PR fix the internal/worker package testing fail due to the same var named in the same package.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.14.4
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.0

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     fix test fail

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[vdaas-ci]

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[codecov]

Codecov Report

Merging #616 into master will increase coverage by 0.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #616      +/-   ##
==========================================
+ Coverage   12.94%   13.72%   +0.77%     
==========================================
  Files         405      409       +4     
  Lines       21294    21516     +222     
==========================================
+ Hits         2757     2953     +196     
- Misses      18264    18284      +20     
- Partials      273      279       +6     

Impacted Files	Coverage Δ
internal/worker/worker_option.go	62.50% <0.00%> (ø)
internal/worker/queue.go	100.00% <0.00%> (ø)
internal/worker/queue_option.go	89.47% <0.00%> (ø)
internal/worker/worker.go	86.36% <0.00%> (ø)

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[hlts2]

thank you
LGTM

[vankichi]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by vankichi for branch: fix/internal/worker/ci

[vdaas-ci]

[FORMAT] Updating license headers and formatting go codes triggered by vankichi.

[vdaas-ci]

[APPROVED] This PR is approved by vankichi.