[7.x] Create our own glog replacement (backport #5809)

[mergify]

This is an automatic backport of pull request #5809 done by Mergify.
Cherry-pick of 7a5fc06 has failed:

On branch mergify/bp/7.x/pr-5809
Your branch is up to date with 'origin/7.x'.

You are currently cherry-picking commit 7a5fc061.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   go.mod
	new file:   internal/glog/glog.go
	new file:   internal/glog/go.mod
	new file:   internal/glog/go.sum
	modified:   script/generate_notice.py
	modified:   tests/Dockerfile

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .gitignore
	both modified:   NOTICE.txt
	both modified:   go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[apmmachine]

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• Start Time: 2021-07-28T02:57:15.031+0000

• Duration: 42 min 37 sec

• Commit: 0363b71

Test stats 🧪

Test	Results
Failed	0
Passed	4541
Skipped	15
Total	4556

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[mergify]

This pull request is now in conflicts. Could you fix it @mergify[bot]? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.x/pr-5809 upstream/mergify/bp/7.x/pr-5809
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-5809