[ipspace]

Closes #3983

[ipspace]

@victorkhgith -- This is probably what we need to implement route redistribution into OSPF. Could you please test it? Thank you!

[victorkhgith]

Tested 70f9bfd with containerlab, using the OcNOS 7.0.0-262 VM image as the device under test and FRR probes. All six relevant tests pass:

• ospf/ospfv2/10-import and ospf/ospfv3/10-import: pass. On the parent commit (53eb24d), they stop at netlab create ("does not support route import into ospf").
• vrf/15-multi-vrf-mixed, vrf/23-multi-vrf-mixed-ipv6 and vrf/35-vrf-asymmetric-leaking: pass. On 53eb24d, they fail on the redistribution checks ("BGP is not redistributed into OSPF", missing OSPF/OSPFv3 prefixes) and the pings that depend on them.
• bgp/30-import-ds-ospf: still passes.

11-import-policy (OSPFv2 and OSPFv3) stops at netlab create with "cannot use routing policies on route imports", as expected with no_policy.

[ipspace]

Nice. Thanks a million. Merging.