[agent-sidecar] Add cancel hook for file watcher

[rinx]

Signed-off-by: Rintaro Okamura rintaro.okamura@gmail.com

Description:

Added cancel hook for file watcher.
agent-sidecar does not stop correctly when it receives SIGTERM without it.

made the default post_stop_timeout longer.

Related Issue:

nothing.

How Has This Been Tested?:

nothing.

Environment:

• Go Version: 1.14.3
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.11.5

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

---

Optimal code review plan

     🐛 Add cancel hook for file watcher

Powered by Pull Assistant. Last update 0567c23 ... 0567c23. Read the comment docs.

[github-actions]

[golangci] _{reported by reviewdog 🐶}
only one cuddle assignment allowed before defer statement (wsl)

[codecov]

Codecov Report

Merging #535 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##           master    #535      +/-   ##
=========================================
- Coverage    9.10%   9.09%   -0.01%     
=========================================
  Files         402     402              
  Lines       20831   20837       +6     
=========================================
  Hits         1896    1896              
- Misses      18681   18687       +6     
  Partials      254     254              

Impacted Files	Coverage Δ
pkg/agent/sidecar/service/observer/observer.go	0.00% <0.00%> (ø)
pkg/agent/sidecar/service/observer/option.go	8.82% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c1c0eab...0567c23. Read the comment docs.

[rinx]

/rebase
/format

[vdaas-ci]

[REBASE] Rebase triggered by rinx for branch: bugfix/agent-sidecar/add-cancel-hook-for-internal-file-watch

[vdaas-ci]

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

[kpango]

LGTM