fix itest re `blockbeat` #515

Job	Run time
check commits	48m 2s
lint code	7m 48s
cross compilation	30m 50s
RPC and mobile compilation check	6m 32s
sample configuration check	4m 19s
Sqlc check	4m 56s
run unit tests (btcd unit-cover)	20m 8s
run unit tests (unit tags="kvdb_etcd")	20m 42s
check pinned dependencies (google.golang.org/grpc v1.59.0)	5s
run macOS itest	1h 3m 58s
run unit tests (unit tags="kvdb_postgres")	20m 12s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	6s
run unit tests (unit tags="kvdb_sqlite")	18m 31s
run unit tests (btcd unit-race)	40m 12s
run unit tests (unit-module)	4m 18s
run windows itest	7m 23s
run ubuntu itests (btcd, backend=btcd cover=1)	48m 35s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	55m 58s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	55m 43s
check release notes updated	4s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	55m 35s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 8m 41s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 21m 39s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	55m 58s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 22m 9s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	55m 33s
run ubuntu itests (neutrino, backend=neutrino cover=1)	50m 56s
finish	2s
	15h 8m 55s

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