clear pod cpuset to support "cpuManagerPolicy=static" #1427

Job	Run time
tests (vmm/sandbox, --all-features)	3m 49s
checks (vmm/sandbox, --all-features)	5m 5s
tests (vmm/task, --all-features)	3m 9s
checks (vmm/task, --all-features)	4m 34s
tests (shim, --all-features)	2m 30s
checks (shim, --all-features)	4m 8s
tests (quark, --all-features)	2m 21s
checks (quark, --all-features)	4m 1s
tests (runc, --all-features)	2m 58s
checks (runc, --all-features)	4m 30s
tests (wasm, --features=wasmedge, 0.13.5)	3m 15s
checks (wasm, --features=wasmedge, 0.13.5)	4m 40s
tests (wasm, --features=wasmtime)	3m 30s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	4m 44s
checks (wasm, --features=wasmtime)	4m 50s
	58m 4s

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