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bugfixes:
  - vyos_l3_interfaces - fix replace in interfaces to remove vif completely if not present in new config
  - vyos_l3_interfaces - fix override in interfaces to remove vif completely if not present in new config
  - vyos_l3_interfaces - fix delete in interfaces to remove vif completely if in affected interface

trivial:
  - vyos_l3_interfaces - fix integration tests for `l3_interfaces`
  - vyos_l3_interfaces - fix integration tests for `interfaces`
  - vyos_l3_interfaces - added unit test for unknown interface type