T6643: firewall: fix ip address range parsing on firewall rules. (backport #3964)

[mergify]

Change Summary

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/T6643

Related PR(s)

Component(s) name

firewall

Proposed changes

How to test

vyos@T6643# run show config comm | grep firewall
set firewall ipv4 forward filter rule 1 action 'drop'
set firewall ipv4 forward filter rule 1 destination address '192.0.2.100-192.0.2.253'
[edit]
vyos@T6643# sudo nft list chain ip vyos_filter VYOS_FORWARD_filter
table ip vyos_filter {
	chain VYOS_FORWARD_filter {
		type filter hook forward priority filter; policy accept;
		ip daddr 192.0.2.100-192.0.2.253 counter packets 0 bytes 0 drop comment "ipv4-FWD-filter-1"
		counter packets 0 bytes 0 accept comment "FWD-filter default-action accept"
	}
}
[edit]
vyos@T6643# 

Smoketest result

test_firewall.py --> OK
test_policy_route.py --> OK
test_nat.py --> OK

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 #3964 done by [Mergify](https://mergify.com).

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