[backport] Fix handling of print period in EvaluationMonitor (#6499)#6534

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trivialfis merged 1 commit intodmlc:release_1.3.0from trivialfis:backport-em

Dec 20, 2020

+16-11

Commits on Dec 20, 2020

Fix handling of print period in EvaluationMonitor (dmlc#6499 )

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