release-19.3:Backport!2603

Merged Andrey Vertiprahov requested to merge cherry-pick-f86aa888 into release-19.3

DCN.DCWL.get_interfaces. Filter "00:00:00:00:00:00" MAC.

See merge request !2603 (merged)

(cherry picked from commit f86aa888)

525e88b5 DCN.DCWL.get_interfaces. Filter "00:00:00:00:00:00" MAC. 9868d2ef Fix black.

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