T7012 OSPFv2 integration tests fixes (#395)

• init for ospfv2

• ospfv2 rtt and merge and merge_update tests fixed

• ospfv2 integration test partial fix

• ospfv2 integration tests new structure and 1.4+ fixes

• ospfv2 1.3- unit tests

• ospfv2 changelog

• Added unit tests suite for 1.4+ and vyos_ospfv2

• fixed some netsted dict, added pasive-interface default, added passive-interface exclude for 1.4+

• passive-interface-exclude support for 1.4+

• fix remove func for passive-interface-exclude in 1.4+ ospfv2

• parsed.yaml update

• leftovers removed

• prepare_vyous_tests.yaml to use network_cli and fail fast

• ospfv2 integration tests pre-requisite scripts

• reverted prepare_vyos_tests script

• facts regex corrected

• reworked facts regex

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Co-authored-by: Daniil Baturin <daniil@baturin.org>