release-20.1:Backport!3453

Merged Andrey Vertiprahov requested to merge cherry-pick-6c8a7c30 into release-20.1

Convert command_submit on self.cli to bytes.

See merge request !3453 (merged)

(cherry picked from commit 6c8a7c30)

086d7c59 Convert command_submit on self.cli to bytes.

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