clear pod cpuset to support "cpuManagerPolicy=static" #1411

Job	Run time
tests (vmm/sandbox, --all-features)	3m 45s
tests (vmm/task, --all-features)	3m 16s
checks (vmm/sandbox, --all-features)	1m 35s
tests (shim, --all-features)	3m 8s
checks (vmm/task, --all-features)	1m 34s
tests (quark, --all-features)	2m 31s
checks (shim, --all-features)	1m 23s
tests (runc, --all-features)	2m 53s
checks (quark, --all-features)	1m 15s
tests (wasm, --features=wasmedge, 0.13.5)	3m 11s
checks (runc, --all-features)	1m 34s
tests (wasm, --features=wasmtime)	3m 39s
checks (wasm, --features=wasmedge, 0.13.5)	1m 31s
checks (wasm, --features="wasmedge, wasmedge_wasi_nn", 0.13.5)	1m 34s
checks (wasm, --features=wasmtime)	1m 34s
	34m 23s

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