feat(vmware): Convert imc network config to Networking config Version 2

[PengpengSun]

Proposed Commit Message

feat(vmware): Convert imc network config to Networking config Version 2

To support dhcp4-overrides and dhcp6-overrides, we need to convert network configuration read from imc configuration file to v2 instead of v1.
This PR also adds ipv6 routes support.

If you need to write multiple paragraphs, feel free.

Fixes LP: #1776452

Additional Context

Test Steps

Merge type

• Squash merge using "Proposed Commit Message"
• Rebase and merge unique commits. Requires commit messages per-commit each referencing the pull request number (#<PR_NUM>)

[github-actions]

Hello! Thank you for this proposed change to cloud-init. This pull request is now marked as stale as it has not seen any activity in 14 days. If no activity occurs within the next 7 days, this pull request will automatically close.

If you are waiting for code review and you are seeing this message, apologies! Please reply, tagging TheRealFalcon, and he will ensure that someone takes a look soon.

(If the pull request is closed and you would like to continue working on it, please do tag TheRealFalcon to reopen it.)

[PengpengSun]

Hello! Thank you for this proposed change to cloud-init. This pull request is now marked as stale as it has not seen any activity in 14 days. If no activity occurs within the next 7 days, this pull request will automatically close.

If you are waiting for code review and you are seeing this message, apologies! Please reply, tagging TheRealFalcon, and he will ensure that someone takes a look soon.

(If the pull request is closed and you would like to continue working on it, please do tag TheRealFalcon to reopen it.)

tag @TheRealFalcon to reopen it, thanks~

[TheRealFalcon]

@sshedi , is this something you could review too?

[TheRealFalcon]

Overall the changes look good. I left a few inline comments.

[PengpengSun]

Overall the changes look good. I left a few inline comments.

Thanks @TheRealFalcon for the review, I'm traveling during spring festival here, probably won't be able to address any comments until Feb.5.

[sshedi]

@PengpengSun I believe this change is opaque to user, right?

Need some changes, PTAL.

[PengpengSun]

@PengpengSun I believe this change is opaque to user, right?

Right, it converts customization config to network v2 config supported by cloud-init, not written network configuration to Guest OS directly.

Need some changes, PTAL.

Thanks @sshedi for the review, I will address the comments.

[sshedi]

LGTM. Thanks @PengpengSun

[TheRealFalcon]

LGTM!