Beat itest [3/3]: fix all itest flakes #16775

Job	Run time
check commits	12m 7s
check pinned dependencies (google.golang.org/grpc v1.59.0)	12s
cross compilation	30m 35s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
lint code	10m 47s
run macOS itest	18m 29s
check release notes updated	6s
RPC and mobile compilation check	8m 43s
sample configuration check	5m 58s
Sqlc check	4m 24s
run ubuntu itests (btcd, backend=btcd cover=1)	19m 41s
run windows itest	36m 43s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	23m 1s
run unit tests (btcd unit-cover)	19m 37s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	21m 9s
run unit tests (unit tags="kvdb_etcd")	20m 56s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	23m 1s
run unit tests (unit tags="kvdb_postgres")	20m 5s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	28m 37s
run unit tests (unit tags="kvdb_sqlite")	18m 22s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	40m 54s
run unit tests (btcd unit-race)	40m 13s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	22m 50s
run unit tests (unit-module)	1m 2s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	39m 7s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	24m 15s
run ubuntu itests (neutrino, backend=neutrino cover=1)	22m 20s
finish	3s
	8h 33m 21s

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