Merge pull request #330 from chenyukang/yukang-fix-timestamp-graph-ch… #1412

Job	Run time
e2e test for 3-nodes-transfer --env test	4m 24s
e2e test for invoice-ops --env test	3m 45s
e2e test for open-use-close-a-channel --env test	3m 59s
e2e test for udt --env test	4m 2s
e2e test for reestablish --env test	3m 50s
e2e test for cross-chain-hub --env test	4m 12s
e2e test for router-pay --env test	4m 58s
e2e test for udt-router-pay --env test	4m 5s
e2e test for udt --env xudt-test	4m 18s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	4m 17s
	41m 50s

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