Save our own broadcast message directly and save raw gossip message from peers to memory first #1986

Job	Run time
e2e test for 3-nodes-transfer --env test	4m 42s
e2e test for invoice-ops --env test	3m 48s
e2e test for open-use-close-a-channel --env test	4m 1s
e2e test for udt --env test	4m 15s
e2e test for reestablish --env test	4m 5s
e2e test for cross-chain-hub --env test	4m 7s
e2e test for router-pay --env test	5m 20s
e2e test for udt-router-pay --env test	4m 25s
e2e test for watchtower --env test	5m 27s
e2e test for udt --env xudt-test	4m 17s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	4m 31s
	48m 58s

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