Fixups to scheduler/priority settings #7224

Job	Run time
cross-i386	59s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 13s
test (ubuntu-20.04, 1.22.x, rootless)	6m 55s
test (ubuntu-20.04, 1.22.x, -race)	7m 37s
test (ubuntu-20.04, 1.22.x)	6m 54s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 21s
test (ubuntu-20.04, 1.23.x, rootless)	6m 55s
test (ubuntu-20.04, 1.23.x, -race)	7m 41s
test (ubuntu-20.04, 1.23.x)	7m 1s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 35s
test (ubuntu-24.04, 1.22.x, rootless, -race)	10m 45s
test (ubuntu-24.04, 1.22.x, rootless)	9m 19s
test (ubuntu-24.04, 1.22.x, -race)	7m 30s
test (ubuntu-24.04, 1.22.x)	6m 44s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 47s
test (ubuntu-24.04, 1.23.x, rootless)	9m 48s
test (ubuntu-24.04, 1.23.x, -race)	8m 53s
test (ubuntu-24.04, 1.23.x)	7m 36s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 1s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 33s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 50s
all-done	1s
	2h 43m 58s

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