healthcheck: make sure chain backend has enough outbound peers [TEST 2] #14

Job	Run time
RPC and mobile compilation check	1m 26s
lint code	3m 12s
check commits	3m 3s
Sqlc check	23s
cross compilation	27m 27s
run unit tests (btcd unit-cover)	16m 9s
run unit tests (unit tags="kvdb_etcd")	18m 14s
run unit tests (unit tags="kvdb_postgres")	17m 39s
sample configuration check	26s
run unit tests (unit tags="kvdb_sqlite")	16m 55s
check pinned dependencies (google.golang.org/grpc v1.56.3)	5s
run unit tests (btcd unit-race)	34m 56s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	3s
run macOS itest	58m 47s
run unit tests (unit-module)	55s
check release notes updated	5s
run ubuntu itests (btcd, backend=btcd)	41m 26s
run windows itest	53m 49s
run ubuntu itests (bitcoind, backend=bitcoind)	53m 17s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	54m 14s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	52m 36s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 9m 54s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 23m 14s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	54m 2s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1h 24m 39s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	54m 57s
run ubuntu itests (neutrino, backend=neutrino)	50m 15s
	14h 12m 8s

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