feat: Add ability to enable Longhorn V2 Data Engine (backport #55)

[mergify]

This adds longhornConfigs.enableV2DataEngine to the node config CRD. When this value is set to true, we:

• Add persistent config to /oem/99_settings.yaml to run modprobe and allocate hugepages on system boot
• Run modprobe and allocate hugepages at runtime, to try to avoid having to reboot the system
• Restart the kubelet so longhorn is able to verify the allocated hugepages

It's probably easier to review this commit-by-commit, because I added some tests and did some refactoring first, to make sure I wasn't going to break the ntp config persistence.

Related issue: harvester/harvester#5274

---

This is an automatic backport of pull request #55 done by Mergify.

[mergify]

Cherry-pick of fb60534 has failed:

On branch mergify/bp/v0.3.x/pr-55
Your branch is ahead of 'origin/v0.3.x' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit fb60534.
  (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:   pkg/controller/nodeconfig/config/common.go
	modified:   pkg/controller/nodeconfig/config/config_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   pkg/controller/nodeconfig/config/ntp.go

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

[tserong]

I've manually fixed this so it also pulls in #56, and verified with:

> git cherry -v upstream/master upstream/mergify/bp/v0.3.x/pr-55
- db0249f7fd6191eeb4fb8eaf0eca2854721b8e87 feat: bump go-common
- 2df726ef107da6e2dc8f13aec6f4260515a38002 test: add TestNTPConfigPersistence
- b2b12b3bb6f1a1912eb4ac17d6f8c3e15b37b9a2 refactor: decouple OEM setting persistence ftom NTP
- 1f16191bb23ebd2a4f7ba24c0606655cddae6b57 build: add scripts/generate
- 120ff96875c93ca865e183513db7cd219d922f60 feat: Add ability to enable Longhorn V2 Data Engine

> git cherry -v  upstream/mergify/bp/v0.3.x/pr-55 upstream/master
+ 9f7bc62227000640f342e810ca8b49d8a9fd2663 feat: add renovate.json & mergify.yml
- 30a0bd437d055aef895b923963eabdb2ddf85166 feat: bump go-common
- 97d8390bfb19b014a9b6c65fe9d1e1a6fcf6bf87 test: add TestNTPConfigPersistence
- fb605342392da0987ab2a2faff4fd2b3276dd0c3 refactor: decouple OEM setting persistence ftom NTP
- f45269c527ca852308fa845d78acf2e43b5accd8 build: add scripts/generate
- 75ec9294026e87b1ecbb46e2c4b0455137a6c233 feat: Add ability to enable Longhorn V2 Data Engine

> git diff upstream/mergify/bp/v0.3.x/pr-55 upstream/master
[only shows changes from 9f7bc62227000640f342e810ca8b49d8a9fd2663 feat: add renovate.json & mergify.yml"]