release-20.1:Backport!3725

Merged Andrey Vertiprahov requested to merge cherry-pick-caec3f92 into release-20.1

HP.ProCurve. Cleanup py3.

See merge request !3725 (merged)

(cherry picked from commit caec3f92)

f03b1469 HP.ProCurve. Cleanup py3.

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