Add more hierarchy to fiber message for easier processing #318

Job	Run time
e2e test for 3-nodes-transfer --env test	10m 10s
e2e test for invoice-ops --env test	9m 57s
e2e test for open-use-close-a-channel --env test	10m 25s
e2e test for udt --env test	10m 3s
e2e test for reestablish --env test	9m 58s
e2e test for cross-chain-hub --env test	10m 22s
e2e test for udt --env xudt-test	10m 3s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	10m 33s
	1h 21m 31s

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