release-19.3:Backport!2777

Merged Andrey Vertiprahov requested to merge cherry-pick-43d772ff into release-19.3

Huawei.VRP.get_mpls_vpn. Fix shifting string output trace.

See merge request !2777 (merged)

(cherry picked from commit 43d772ff)

dd239afd Huawei.VRP.get_mpls_vpn. Fix shifting string output trace. 2b5b047f Fix black.

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