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Operation tests hurt from fake time coupled with log file rotation

Łukasz Bujak requested to merge operation_tests-performance-fix into develop
  • Operation tests launch plenty of hived instances. Each of them spawns a separate logging thread.
  • It's been discovered that each of the logging threads takes up to 100% processing core time.
  • Most probable reason is that fc scheduler works poorly with fake time (used in these tests).
  • This MR turns off log file rotation for sped up nodes, eliminating rotation task scheduling and thus the excessive load of logging threads.

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