release-20.2:Backport!4139

Merged Andrey Vertiprahov requested to merge cherry-pick-0c5e36c6 into release-20.2

Generic.get_interfaces. Fix mtu None value trace.

See merge request !4139 (merged)

(cherry picked from commit 0c5e36c6)

9c9d83e6 Generic.get_interfaces. Fix mtu None value trace.

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