T5729: firewall: switch to valueless in (backport #2471)

[mergify]

This is an automatic backport of pull request #2471 done by Mergify.
Cherry-pick of c4409d6 has failed:

On branch mergify/bp/sagitta/pr-2471
Your branch is up to date with 'origin/sagitta'.

You are currently cherry-picking commit c4409d6a4.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   interface-definitions/include/firewall/log.xml.i
	new file:   interface-definitions/include/firewall/state.xml.i
	modified:   interface-definitions/include/nat-rule.xml.i
	modified:   interface-definitions/include/policy/route-common.xml.i
	modified:   interface-definitions/include/version/firewall-version.xml.i
	modified:   interface-definitions/include/version/policy-version.xml.i
	modified:   interface-definitions/nat66.xml.in
	modified:   smoketest/scripts/cli/test_policy_route.py
	modified:   src/conf_mode/firewall.py
	modified:   src/migration-scripts/firewall/11-to-12
	new file:   src/migration-scripts/firewall/12-to-13
	new file:   src/migration-scripts/policy/6-to-7

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   interface-definitions/include/firewall/common-rule-bridge.xml.i
	both modified:   interface-definitions/include/firewall/common-rule-inet.xml.i
	both modified:   python/vyos/firewall.py
	both modified:   smoketest/scripts/cli/test_firewall.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[c-po]

@nicolas-fort will provide a manual backport