Fix error handling of SearchByID API in lb gateway

[rinx]

Description:

• I've just found a typo in the code. -> fixed
• also, I've found an ambiguous function name in internal/db -> renamed.

Related Issue:

nothing

How Has This Been Tested?:

nothing

Environment:

• Go Version: 1.16
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.3

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.

[rinx]

/rebase
/format

[vdaas-ci]

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[vdaas-ci]

[REBASE] Rebase triggered by rinx for branch: bugfix/gateways/fix-error-handling-codes

[vdaas-ci]

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

[kpango]

LGTM

[codecov]

Codecov Report

Merging #1084 (769061e) into master (0beb8ae) will decrease coverage by 1.07%.
The diff coverage is 1.07%.

@@            Coverage Diff             @@
##           master    #1084      +/-   ##
==========================================
- Coverage   15.25%   14.17%   -1.08%     
==========================================
  Files         498      495       -3     
  Lines       28770    29190     +420     
==========================================
- Hits         4389     4139     -250     
- Misses      24110    24796     +686     
+ Partials      271      255      -16     

Impacted Files	Coverage Δ
pkg/gateway/lb/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/meta/cassandra/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/meta/redis/handler/grpc/handler.go	0.00% <0.00%> (ø)
internal/db/rdb/mysql/mysql.go	94.46% <100.00%> (ø)
internal/worker/worker.go	82.29% <0.00%> (-2.09%)	⬇️
internal/worker/queue.go	98.33% <0.00%> (-1.67%)	⬇️
internal/net/dialer.go
internal/net/net.go
internal/net/option.go

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[kpango]

I thought @vankichi wrote internal/db logging function, so could you please review this PR?

[vankichi]

LGTM
thanks!