Merge pull request #77 from yuqitao/kill-all-processes #459

Job	Run time
checks (vmm/sandbox, --all-features)	7m 51s
checks (vmm/task, --all-features)	9m 46s
checks (shim, --all-features)	9m 10s
checks (quark, --all-features)	7m 33s
checks (wasm, --features=wasmedge, 0.11.2)	7m 38s
checks (wasm, --features=wasmtime)	8m 35s
tests (vmm/sandbox, --all-features)	5m 0s
tests (vmm/task, --all-features)	4m 24s
tests (shim, --all-features)	4m 10s
tests (quark, --all-features)	5m 11s
tests (wasm, --features=wasmedge, 0.11.2)	5m 39s
tests (wasm, --features=wasmtime)	8m 3s
	1h 23m 0s

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