HEP: Update MTU and NAD

[w13915984028]

IMPORTANT: Please do not create a Pull Request without creating an issue first.

Problem:

The MTU is not fully synced between different objects, users also have some questions.

Solution:

Review the MTU belonging and the enhancement to current network controller.

Related Issue:
#4355

Test plan:

[w13915984028]

BTW, to reviewer:

This is an open discussion about the potential enhancement to the networking related feature in Harvester, more than the single MTU issue. Please feel free to leave your comments, thanks.

[votdev]

It should be specified whether MTU or MTU should be used in the document. But then it should be consistent.

[w13915984028]

FYI: With more investigation and analysis, I just added a second commit.

A short summary: https://github.com/w13915984028/harvester/blob/hepmtu/enhancements/20240820-mtu-and-network-information-propagation.md#short-summary

[w13915984028]

The summary of HEP review meeting:

(1) V1.4.0 will focus on manual operation of chaning MTU, with a document and essential enhancements on code.
(2) V1.5.0 will consider to add a controller to sync the MTU from clusternetwork to vlanconfig and NAD.
(3) V1.5.0 will add an enhancement for the management network: check if MTU of management network on each node is same.

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This PR is stale because it has been open for 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions]

This PR is stale because it has been open for 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions]

This PR was closed because it has been stalled for 10 days with no activity.