nydusify: refactor check subcommand #3396

Job	Run time
contrib-unit-test-coverage	1m 36s
nydus-build (amd64)	2m 15s
contrib-lint (contrib/nydusify)	1m 4s
nydus-build (arm64)	2m 10s
contrib-build (amd64)	45s
cargo-deny	39s
contrib-lint (contrib/nydus-overlayfs)	50s
contrib-build (arm64)	21s
nydus-build (ppc64le)	2m 0s
contrib-build (ppc64le)	40s
nydus-build (riscv64)	2m 7s
nydusd-build-macos (amd64)	4m 11s
contrib-build (riscv64)	40s
nydus-unit-test	4m 42s
nydusd-build-macos (arm64)	4m 20s
nydus-unit-test-coverage	3m 24s
takeover-test	1m 50s
nydus-integration-test	9m 55s
performance-test (fs-version-5)	1m 56s
performance-test (fs-version-6)	2m 0s
performance-test (zran)	1m 34s
upload-coverage-to-codecov	0s
	48m 59s

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