T6701: Added ability to disable the container DNS plugin (backport #4032)

[mergify]

Add ability to set the container network with a disable-dns setting to disable the DNS plugin that is on be default.

Change Summary

This changes allows one to configure a container network without using the built-in DNS plugin.

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/T6701

Related PR(s)

Component(s) name

podman

Proposed changes

Adds ability to set disable-dns on a container network

set container network PODNET disable-dns

How to test

set container network PODNET prefix '10.10.10.0/24'
set container network PODNET disable-dns
commit

run show ip port | grep 10\.10\.10\.1 | grep 53

You should have no DNS port 53 shown on the ports used for the container network.

Without the "disable-dns" setting, you will see a UDP port 53 owned by the "aardvark-dns" process

udp 0 0 10.10.10.1:53 0.0.0.0:* 25950/aardvark-dns

Smoketest result

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

---

This is an automatic backport of pull request #4032 done by [Mergify](https://mergify.com).

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