lsps2: cleanup expired promises #107

Job	Run time
build-lspd	2m 14s
setup-bitcoin-core	4s
setup-cln	12s
Run unit tests	2m 26s
setup-itest	12s
setup-lnd-client	5s
setup-lnd-lsp	7s
test CLN testLsps0GetProtocolVersions	1m 57s
test CLN testLsps2GetVersions	1m 48s
test CLN testLsps2GetInfo	1m 38s
test CLN testLsps2Buy	1m 36s
test CLN testLsps2HappyFlow	1m 50s
test CLN testLsps2Cltv	1m 50s
test CLN testLsps2NoBalance	2m 25s
test CLN testLsps2ZeroConfUtxo	2m 3s
test LND testOpenZeroConfChannelOnReceive	2m 9s
test CLN testOpenZeroConfChannelOnReceive	1m 52s
test LND testOpenZeroConfSingleHtlc	1m 46s
test CLN testOpenZeroConfSingleHtlc	1m 49s
test LND testZeroReserve	2m 0s
test CLN testZeroReserve	1m 48s
test LND testFailureBobOffline	1m 49s
test CLN testFailureBobOffline	2m 38s
test LND testNoBalance	1m 49s
test CLN testNoBalance	1m 53s
test LND testRegularForward	1m 49s
test CLN testRegularForward	1m 52s
test LND testProbing	2m 28s
test CLN testProbing	2m 24s
test LND testInvalidCltv	1m 48s
test CLN testInvalidCltv	2m 3s
test LND registerPaymentWithTag	2m 13s
test CLN registerPaymentWithTag	2m 20s
test LND testOpenZeroConfUtxo	1m 48s
test CLN testOpenZeroConfUtxo	2m 37s
test LND testDynamicFeeFlow	2m 30s
test CLN testDynamicFeeFlow	1m 49s
test LND testOfflineNotificationPaymentRegistered	1m 52s
test CLN testOfflineNotificationPaymentRegistered	2m 16s
test LND testOfflineNotificationRegularForward	1m 53s
test CLN testOfflineNotificationRegularForward	2m 27s
test LND testOfflineNotificationZeroConfChannel	2m 19s
test CLN testOfflineNotificationZeroConfChannel	2m 23s
	1h 18m 51s

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