a series of fixups for nydusd #2952

Job	Run time
contrib-lint (contrib/nydusify)	16s
contrib-lint (contrib/ctr-remote)	14s
contrib-unit-test-coverage	1m 36s
contrib-lint (contrib/nydus-overlayfs)	10s
contrib-build (amd64)	30s
nydus-build (amd64)	2m 9s
contrib-build (arm64)	55s
nydus-build (arm64)	2m 26s
contrib-build (ppc64le)	46s
nydus-build (ppc64le)	2m 16s
nydusd-build-macos (amd64)	4m 7s
contrib-build (riscv64)	47s
nydus-unit-test	5m 14s
nydus-build (riscv64)	2m 5s
nydusd-build-macos (arm64)	3m 29s
cargo-deny	38s
nydus-unit-test-coverage	4m 0s
takeover-test	1m 35s
nydus-integration-test	19m 48s
performance-test (fs-version-5)	15m 39s
performance-test (fs-version-6)	1m 20s
performance-test (zran)	15m 23s
upload-coverage-to-codecov	10s
	1h 25m 33s

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