Don't block on channel arbitator startup #16754

Job	Run time
Sqlc check	31s
RPC and mobile compilation check	2m 21s
cross compilation	31m 40s
check pinned dependencies (google.golang.org/grpc v1.59.0)	8s
check commits	3m 6s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
lint code	5m 13s
sample configuration check	1m 12s
run unit tests (btcd unit-cover)	19m 13s
run macOS itest	51m 39s
run unit tests (unit tags="kvdb_etcd")	21m 43s
check release notes updated	5s
run unit tests (unit tags="kvdb_postgres")	20m 5s
run unit tests (unit tags="kvdb_sqlite")	18m 18s
run ubuntu itests (btcd, backend=btcd cover=1)	30m 58s
run unit tests (btcd unit-race)	40m 27s
run windows itest	7m 15s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	39m 47s
run unit tests (unit-module)	1m 9s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	39m 17s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	40m 6s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	53m 32s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 10m 12s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	42m 9s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 10m 27s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	43m 42s
run ubuntu itests (neutrino, backend=neutrino cover=1)	38m 14s
finish	3s
	11h 32m 38s

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