vmm task: should kill all process even no bundle #457

Job	Run time
tests (vmm/sandbox, --all-features)	6m 19s
tests (vmm/task, --all-features)	6m 12s
tests (shim, --all-features)	5m 33s
tests (quark, --all-features)	5m 7s
tests (wasm, --features=wasmedge, 0.11.2)	5m 51s
tests (wasm, --features=wasmtime)	5m 52s
checks (vmm/sandbox, --all-features)	2m 40s
checks (vmm/task, --all-features)	2m 26s
checks (shim, --all-features)	2m 46s
checks (quark, --all-features)	2m 43s
checks (wasm, --features=wasmedge, 0.11.2)	2m 42s
checks (wasm, --features=wasmtime)	2m 44s
	50m 55s

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