dhcpv6: T7807: update build environment for dhcpcd

[cpcowart]

Change summary

This update to the build environment pairs with a related change in vyos-1x to change the dhcpv6 client from WIDE to dhcpcd. Specifically, updates the systemd unit getting stopped in the build process.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T7807

Related PR(s)

• dhcpv6: T7807: replace wide-dhcpv6-client (dhcp6c) with dhcpcd vyos-1x#5147

How to test / Smoketest result

I built images with the related vyos-1x changes. The new dhcpcd build script should generate a +vyos0 suffixed package that is needed for the iso to build properly.

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• [N] My change requires a change to the documentation
• [N/A] I have updated the documentation accordingly

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No issues in PR Title / Commit Title

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CI logs

• Config tests ❌ failed

[cpcowart]

This commit is building fine for me if I manually build the kernel packages.