routing: shutdown chanrouter correctly. #15004

Job	Run time
Sqlc check	3m 13s
RPC and mobile compilation check	7m 32s
check commits	1m 53s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
lint code	6m 30s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	5s
cross compilation	12m 26s
sample configuration check	5m 32s
run unit tests (btcd unit-cover)	16m 12s
run macOS itest	39m 47s
run unit tests (unit tags="kvdb_etcd")	18m 52s
run ubuntu itests (btcd, backend=btcd cover=1)	25m 58s
run unit tests (unit tags="kvdb_postgres")	18m 5s
run unit tests (unit tags="kvdb_sqlite")	17m 26s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	31m 46s
run windows itest	37m 6s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	31m 13s
run unit tests (btcd unit-race)	34m 55s
run unit tests (unit-module)	1m 11s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	33m 21s
check release notes updated	4s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	42m 58s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	57m 45s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	33m 6s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	57m 15s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	32m 52s
run ubuntu itests (neutrino, backend=neutrino cover=1)	31m 10s
finish	6s
	9h 58m 23s

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