Fixups to scheduler/priority settings #6983

Job	Run time
cross-i386	1m 31s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 17s
test (ubuntu-20.04, 1.22.x, rootless)	7m 4s
test (ubuntu-20.04, 1.22.x, -race)	7m 54s
test (ubuntu-20.04, 1.22.x)	7m 24s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 28s
test (ubuntu-20.04, 1.23.x, rootless)	7m 16s
test (ubuntu-20.04, 1.23.x, -race)	8m 10s
test (ubuntu-20.04, 1.23.x)	7m 18s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 50s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 42s
test (ubuntu-24.04, 1.22.x, rootless)	9m 30s
test (ubuntu-24.04, 1.22.x, -race)	7m 54s
test (ubuntu-24.04, 1.22.x)	7m 24s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 38s
test (ubuntu-24.04, 1.23.x, rootless)	9m 37s
test (ubuntu-24.04, 1.23.x, -race)	8m 42s
test (ubuntu-24.04, 1.23.x)	7m 17s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 47s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 37s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 21s
all-done	1s
	2h 47m 42s

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