runc exec: implement CPU affinity #7273

Job	Run time
cross-i386	57s
test (ubuntu-20.04, 1.22.x, rootless, -race)	2m 48s
test (ubuntu-20.04, 1.22.x, rootless)	2m 23s
test (ubuntu-20.04, 1.22.x, -race)	4m 59s
test (ubuntu-20.04, 1.22.x)	4m 13s
test (ubuntu-20.04, 1.23.x, rootless, -race)	3m 6s
test (ubuntu-20.04, 1.23.x, rootless)	2m 28s
test (ubuntu-20.04, 1.23.x, -race)	4m 59s
test (ubuntu-20.04, 1.23.x)	4m 37s
test (ubuntu-20.04, 1.23.x, criu-dev)	4m 55s
test (ubuntu-24.04, 1.22.x, rootless, -race)	2m 42s
test (ubuntu-24.04, 1.22.x, rootless)	3m 16s
test (ubuntu-24.04, 1.22.x, -race)	7m 38s
test (ubuntu-24.04, 1.22.x)	6m 48s
test (ubuntu-24.04, 1.23.x, rootless, -race)	3m 37s
test (ubuntu-24.04, 1.23.x, rootless)	2m 50s
test (ubuntu-24.04, 1.23.x, -race)	8m 47s
test (ubuntu-24.04, 1.23.x)	7m 13s
test (ubuntu-24.04, 1.23.x, criu-dev)	8m 3s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	2m 31s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 59s
all-done	0s
	1h 36m 49s

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