fix error & fatal in normal shutdown

[WindzCUHK]

Description

fix error & fatal in normal shutdown

1. remove

[ERR]:        (authz_proxyd.go:105):        pch: context canceled
[ERR]:        (authz_proxyd.go:123):        sch: [server: context canceled]
[FATAL]:        (/sd/workspace/src/github.com/AthenZ/authorization-proxy/main.go:172):
authorizerd: 1 times appeared: context canceled
server: context canceled

2. add

[INFO]:        authorization proxy received signal: terminated
...
[INFO]:        authorization proxy main process shutdown success

Type of change

• Bug fix
• New feature
• Refactoring (no functional changes, no api changes)
• Non-code changes (update documentation, pipeline, etc.)

Flags

• Breaks backward compatibility
• Requires a documentation update
• Has untestable code

---

Checklist

• Followed the guidelines in the CONTRIBUTING document
• Added prefix [skip ci]/[ci skip]/[no ci]/[skip actions]/[actions skip] in the PR title if necessary
• Tested and linted the code
• Commented the code
• Made corresponding changes to the documentation
• Passed all pipeline checking

Checklist for maintainer

• Use Squash and merge
• Double-confirm the merge message has prefix [skip ci]/[ci skip]/[no ci]/[skip actions]/[actions skip]
• Delete the branch after merge

[WindzCUHK]

about ffcc593: https://go.dev/play/p/m-9cfLAN_MZ

[mlajkim]

I've refactored a part of code while you are on 1on1 @WindzCUHK

[ssunorz]

Comments are not correct.

authorization-proxy/service/server.go

Lines 361 to 362 in 4d63b4e

	// apiShutdown returns any error when shutdown the authorization proxy server.
	// Before shutdown the authorization proxy server, it will sleep config.ShutdownDelay to prevent any issue from K8s