vmm: support VFIO device #733

Job	Run time
checks (vmm/sandbox, --all-features)	4m 49s
tests (vmm/sandbox, --all-features)	3m 14s
checks (vmm/task, --all-features)	4m 23s
tests (vmm/task, --all-features)	3m 3s
checks (shim, --all-features)	4m 18s
tests (shim, --all-features)	2m 34s
checks (quark, --all-features)	4m 8s
tests (quark, --all-features)	2m 28s
checks (runc, --all-features)	4m 0s
tests (runc, --all-features)	2m 46s
checks (wasm, --features=wasmedge, 0.11.2)	4m 26s
tests (wasm, --features=wasmedge, 0.11.2)	2m 41s
checks (wasm, --features=wasmtime)	4m 26s
tests (wasm, --features=wasmtime)	3m 16s
	50m 32s

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