vmm: redirect virtiofsd log to syslog #1184

Job	Run time
tests (vmm/sandbox, --all-features)	3m 35s
checks (vmm/sandbox, --all-features)	4m 42s
tests (vmm/task, --all-features)	2m 50s
checks (vmm/task, --all-features)	4m 0s
tests (shim, --all-features)	2m 45s
checks (shim, --all-features)	4m 22s
tests (quark, --all-features)	2m 33s
checks (quark, --all-features)	3m 52s
tests (runc, --all-features)	2m 41s
checks (runc, --all-features)	5m 1s
tests (wasm, --features=wasmedge, 0.13.5)	3m 49s
checks (wasm, --features=wasmedge, 0.13.5)	4m 51s
tests (wasm, --features=wasmtime)	3m 47s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 54s
checks (wasm, --features=wasmtime)	4m 34s
	58m 16s

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