lsps2: cleanup expired promises #158

Job	Run time
setup-cln	7s
setup-bitcoin-core	4s
build-lspd	2m 52s
Run unit tests	2m 41s
setup-itest	20s
setup-lnd-client	4s
setup-lnd-lsp	9s
test CLN testLsps0GetProtocolVersions	1m 37s
test LND testOpenZeroConfChannelOnReceive	1m 55s
test CLN testLsps2GetVersions	1m 31s
test CLN testOpenZeroConfChannelOnReceive	1m 50s
test CLN testLsps2GetInfo	1m 31s
test LND testOpenZeroConfSingleHtlc	2m 17s
test CLN testLsps2Buy	2m 6s
test CLN testOpenZeroConfSingleHtlc	2m 0s
test CLN testLsps2HappyFlow	2m 3s
test LND testZeroReserve	1m 51s
test CLN testLsps2Cltv	2m 35s
test CLN testZeroReserve	1m 56s
test CLN testLsps2NoBalance	1m 44s
test LND testFailureBobOffline	2m 11s
test CLN testLsps2ZeroConfUtxo	2m 9s
test CLN testFailureBobOffline	2m 3s
test LND testNoBalance	2m 37s
test CLN testNoBalance	1m 49s
test LND testRegularForward	1m 50s
test CLN testRegularForward	2m 30s
test LND testProbing	2m 13s
test CLN testProbing	2m 4s
test LND testInvalidCltv	1m 46s
test CLN testInvalidCltv	1m 58s
test LND registerPaymentWithTag	2m 2s
test CLN registerPaymentWithTag	1m 47s
test LND testOpenZeroConfUtxo	1m 43s
test CLN testOpenZeroConfUtxo	1m 56s
test LND testDynamicFeeFlow	2m 35s
test CLN testDynamicFeeFlow	2m 11s
test LND testOfflineNotificationPaymentRegistered	2m 38s
test CLN testOfflineNotificationPaymentRegistered	2m 9s
test LND testOfflineNotificationRegularForward	1m 52s
test CLN testOfflineNotificationRegularForward	1m 52s
test LND testOfflineNotificationZeroConfChannel	2m 7s
test CLN testOfflineNotificationZeroConfChannel	2m 23s
	1h 19m 38s

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