Change summary

• Migrate iptables eth+ suffix interfaces to nftables expected eth*
• Fix verify() check for interface or exclude being present in a rule
• Add extra sanity check to get_ipv4_address if interface doesn't exist (yet)

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)

Related PR(s)

How to test / Smoketest result

DEBUG - Running Testcase: /usr/libexec/vyos/tests/smoke/cli/test_load-balancing_wan.py
DEBUG - test_check_chains (__main__.TestLoadBalancingWan.test_check_chains) ... ok
DEBUG - test_criteria_failover_hook (__main__.TestLoadBalancingWan.test_criteria_failover_hook) ... ok
DEBUG - test_table_routes (__main__.TestLoadBalancingWan.test_table_routes) ... ok
DEBUG - 
DEBUG - ----------------------------------------------------------------------
DEBUG - Ran 3 tests in 41.064s
DEBUG - 
DEBUG - 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