Merge pull request #504 from chenyukang/yukang-fix-clippy #2243

Job	Run time
e2e test for 3-nodes-transfer --env test	11m 53s
e2e test for invoice-ops --env test	11m 17s
e2e test for open-use-close-a-channel --env test	12m 0s
e2e test for udt --env test	11m 33s
e2e test for reestablish --env test	11m 26s
e2e test for cross-chain-hub --env test	11m 27s
e2e test for router-pay --env test	12m 25s
e2e test for udt-router-pay --env test	11m 34s
e2e test for watchtower --env test	12m 54s
e2e test for udt --env xudt-test	11m 23s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	12m 9s
	2h 10m 1s

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