nydusify: refactor check subcommand #3395

Job	Run time
contrib-unit-test-coverage	1m 2s
contrib-lint (contrib/nydusify)	55s
contrib-build (amd64)	44s
nydus-build (amd64)	2m 4s
contrib-build (arm64)	19s
contrib-lint (contrib/nydus-overlayfs)	22s
nydus-build (arm64)	2m 8s
cargo-deny	39s
contrib-build (ppc64le)	43s
nydus-build (ppc64le)	2m 11s
contrib-build (riscv64)	43s
nydus-build (riscv64)	2m 2s
nydusd-build-macos (amd64)	4m 15s
nydus-unit-test	4m 36s
nydusd-build-macos (arm64)	2m 38s
nydus-unit-test-coverage	3m 39s
takeover-test	1m 52s
nydus-integration-test	9m 20s
performance-test (fs-version-5)	1m 46s
performance-test (fs-version-6)	1m 52s
performance-test (zran)	1m 45s
upload-coverage-to-codecov	0s
	45m 35s

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