test: add more watchtower e2e test and resolve some force close issues #1676

Job	Run time
e2e test for 3-nodes-transfer --env test	11m 14s
e2e test for invoice-ops --env test	10m 53s
e2e test for open-use-close-a-channel --env test	10m 38s
e2e test for udt --env test	10m 51s
e2e test for reestablish --env test	10m 36s
e2e test for cross-chain-hub --env test	10m 47s
e2e test for router-pay --env test	12m 6s
e2e test for udt-router-pay --env test	11m 0s
e2e test for watchtower --env test	12m 11s
e2e test for udt --env xudt-test	11m 0s
e2e test for 3-nodes-transfer --env test --env-var HASH_ALGORITHM=sha256	10m 52s
	2h 2m 8s

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