Fix e2e-bench-agent CI to fail correctly

[rinx]

Description:

This PR fixes e2e-bench-agent CI to fail correctly.
Includes updates for Makefiles.

Also this PR updates actions/checkout@v1 -> v2 for all workflows.
https://github.com/actions/checkout#checkout-v2

Related Issue:

Nothing

How Has This Been Tested?:

Nothing

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

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.

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - add changelog comment
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase master

[codecov]

Codecov Report

Merging #800 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #800      +/-   ##
==========================================
+ Coverage   17.37%   17.42%   +0.04%     
==========================================
  Files         420      421       +1     
  Lines       19500    19554      +54     
==========================================
+ Hits         3389     3408      +19     
- Misses      15903    15931      +28     
- Partials      208      215       +7     

Impacted Files	Coverage Δ
...enchmark/internal/starter/agent/core/ngt/option.go	0.00% <ø> (ø)
...benchmark/internal/starter/external/ngtd/option.go	0.00% <ø> (ø)
internal/db/storage/blob/s3/reader/reader.go	65.90% <0.00%> (-31.82%)	⬇️
internal/worker/worker.go	82.29% <0.00%> (ø)
internal/net/net.go	85.18% <0.00%> (ø)
internal/worker/queue.go	100.00% <0.00%> (+1.66%)	⬆️

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[kpango]

LGTM

[kmrmt]

LGTM

[kpango]

/rebase
/format
/approve

[vdaas-ci]

[REBASE] Rebase triggered by kpango for branch: ci/e2e-bench-agent/fix-failing-bench-tests

[vdaas-ci]

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

[vdaas-ci]

[APPROVED] This PR is approved by kpango.

[hlts2]

LGTM