vmm: setup hosts, hostname and resolv.conf files #754

Job	Run time
checks (vmm/sandbox, --all-features)	1m 22s
tests (vmm/sandbox, --all-features)	3m 28s
checks (vmm/task, --all-features)	1m 5s
tests (vmm/task, --all-features)	2m 41s
checks (shim, --all-features)	1m 17s
tests (shim, --all-features)	2m 45s
tests (quark, --all-features)	2m 41s
checks (quark, --all-features)	1m 24s
tests (runc, --all-features)	2m 36s
checks (runc, --all-features)	1m 20s
tests (wasm, --features=wasmedge, 0.11.2)	2m 52s
checks (wasm, --features=wasmedge, 0.11.2)	1m 15s
tests (wasm, --features=wasmtime)	3m 19s
checks (wasm, --features=wasmtime)	1m 22s
	29m 27s

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