Set Linux sysctl defaults for vm configuration #1164

Job	Run time
tests (vmm/sandbox, --all-features)	3m 34s
checks (vmm/sandbox, --all-features)	4m 34s
tests (vmm/task, --all-features)	2m 51s
checks (vmm/task, --all-features)	3m 45s
tests (shim, --all-features)	2m 34s
checks (shim, --all-features)	3m 51s
tests (quark, --all-features)	2m 30s
checks (quark, --all-features)	3m 52s
tests (runc, --all-features)	2m 42s
checks (runc, --all-features)	3m 45s
tests (wasm, --features=wasmedge, 0.13.5)	3m 20s
checks (wasm, --features=wasmedge, 0.13.5)	4m 28s
tests (wasm, --features=wasmtime)	3m 53s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 30s
checks (wasm, --features=wasmtime)	4m 41s
	54m 50s

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