fix itest re `blockbeat` #527

Job	Run time
Sqlc check	2m 52s
cross compilation	30m 38s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
check commits	27m 38s
lint code	6m 46s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	5s
run macOS itest	1h 5m 29s
RPC and mobile compilation check	3m 21s
sample configuration check	1m 52s
run ubuntu itests (btcd, backend=btcd cover=1)	48m 9s
run unit tests (btcd unit-cover)	19m 31s
run ubuntu itests (bitcoind, backend=bitcoind cover=1)	54m 32s
run windows itest	6m 38s
run unit tests (unit tags="kvdb_etcd")	21m 10s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	53m 0s
run unit tests (unit tags="kvdb_postgres")	19m 41s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling" cover=1)	55m 11s
run unit tests (unit tags="kvdb_sqlite")	18m 37s
check release notes updated	5s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 8m 42s
run unit tests (btcd unit-race)	39m 33s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 21m 20s
run unit tests (unit-module)	1m 1s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	55m 18s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 23m 29s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	56m 17s
run ubuntu itests (neutrino, backend=neutrino cover=1)	50m 26s
finish	5s
	14h 31m 30s

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