Lock file maintenance #19675

Job	Run time
flow_test (ubuntu-latest-16-cores, 16, mysql-gtid, 6.0, lts)	17m 48s
flow_test (ubuntu-latest-16-cores, 17, mysql-pos, 7.0, stable)	18m 18s
flow_test (ubuntu-latest-16-cores, 18, maria, 8.0, latest)	17m 25s
	53m 31s

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