tests/int: swap-related fixes #6089

Job	Run time
cross-i386	1m 23s
cross-i386 (runc_nodmz)	1m 19s
test (ubuntu-20.04, 1.20.x, rootless, -race)	6m 36s
test (ubuntu-20.04, 1.20.x, rootless)	6m 6s
test (ubuntu-20.04, 1.20.x, -race)	7m 25s
test (ubuntu-20.04, 1.20.x)	6m 37s
test (ubuntu-20.04, 1.21.x, rootless, -race)	6m 58s
test (ubuntu-20.04, 1.21.x, rootless)	6m 11s
test (ubuntu-20.04, 1.21.x, -race)	7m 32s
test (ubuntu-20.04, 1.21.x)	6m 33s
test (ubuntu-20.04, 1.21.x, criu-dev)	7m 13s
test (ubuntu-22.04, 1.20.x, rootless, -race)	10m 34s
test (ubuntu-22.04, 1.20.x, rootless)	10m 14s
test (ubuntu-22.04, 1.20.x, -race)	8m 39s
test (ubuntu-22.04, 1.20.x)	7m 58s
test (ubuntu-22.04, 1.21.x, rootless, -race)	10m 24s
test (ubuntu-22.04, 1.21.x, rootless)	10m 5s
test (ubuntu-22.04, 1.21.x, -race)	8m 43s
test (ubuntu-22.04, 1.21.x)	7m 48s
test (ubuntu-22.04, 1.21.x, runc_nodmz)	8m 13s
test (ubuntu-22.04, 1.21.x, criu-dev)	8m 19s
test (actuated-arm64-6cpu-8gb, 1.21.x, rootless)	11m 8s
test (actuated-arm64-6cpu-8gb, 1.21.x)	8m 9s
	2h 54m 7s

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