itest: kill lnd on windows to access log files #11654

Job	Run time
RPC and mobile compilation check	4m 53s
lint code	9m 50s
check pinned dependencies (google.golang.org/grpc v1.53.0)	7s
check commits	4m 6s
check pinned dependencies (github.com/golang/protobuf v1.5.2)	7s
cross compilation	43m 0s
sample configuration check	1m 49s
Sqlc check	50s
run ubuntu itests (btcd, backend=btcd)	50m 12s
run ubuntu itests (bitcoind, backend=bitcoind)	1h 3m 37s
run unit tests (btcd unit-cover)	18m 15s
run windows itest	1h 9m 55s
run unit tests (unit tags="kvdb_etcd")	19m 35s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	1h 2m 44s
run unit tests (unit tags="kvdb_postgres")	19m 9s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	1h 2m 57s
check release notes updated	0s
run unit tests (unit tags="kvdb_sqlite")	20m 29s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 31m 2s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	2h 3m 18s
run unit tests (btcd unit-race)	51m 58s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	1h 4m 52s
run unit tests (unit-module)	1m 23s
run ubuntu itests (neutrino, backend=neutrino)	1h 1m 26s
	14h 5m 34s

Provide feedback