traffic-policy: T4688: add support for limiter exceed/notexceed actions

[initramfs]

Change Summary

This is a forward port of #18 to the current branch.

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://phabricator.vyos.net/T4688

Component(s) name

traffic-policy

Proposed changes

See #18

How to test

See #18

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
• My change requires a change to the documentation
• I have updated the documentation accordingly

[c-po]

Hi @initramfs,

I wonder if we can put this one on hold and not extend the old Perl code anymore. I am trying my best to get the new QoS python based implementation (https://github.com/c-po/vyos-1x/tree/t4284-qos) into current.

So I'd rather pick up vyos/vyos-1x#1547 to the new implementation and let the old one rest.

Would this be ok for you or is this an urgent need? This would also be in line with the "No new features in the old codebase" approach.

[initramfs]

@c-po Yeah that's no problem, I added this feature for personal use anyway and it can easily be scripted in (I made this PR merely to convert more scripting elements into config).