T5804: nat: remove inbound|outbound interface from old configuration when it was set to <any>.

[nicolas-fort]

Change Summary

In older version, it was mandatory to define inbound or outbound interface in NAT rules. If desired, user could used interface for matching on every interface.
Since that requirement was removed, we also removed the possibility for using . In order to accomplish that requirement, user must omit using inbound|outbound interface matcher.
As done for other matching criteria, if it's not specified, that it's valid for all!

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/T5804

Related PR(s)

#2579

Component(s) name

nat

Proposed changes

How to test

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

[nicolas-fort]

Backport?

[sever-sever]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #2672 T5804: nat: remove inbound|outbound interface from old configuration when it was set to . (backport #2611) has been created for branch sagitta