Improve cncli-leaderlog.sh: strict mode, logging, VRF check, test mode #247

Job	Run time
Build (ubuntu-22.04, ubuntu22, x86_64-unknown-linux-musl, true, nightly)	4m 47s
Build (ubuntu-22.04, ubuntu22, x86_64-unknown-linux-gnu, nightly)	4m 38s
Build (macos-latest, macos, aarch64-apple-darwin, nightly)	3m 36s
Build (windows-latest, windows, x86_64-pc-windows-msvc, nightly)	8m 45s
	21m 46s

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