multi: exit without success code on shutdown req [LINTING TEST] #21

Job	Run time
RPC and mobile compilation check	2m 8s
lint code	5m 28s
cross compilation	10m 52s
check commits	58s
Sqlc check	39s
sample configuration check	35s
run unit tests (btcd unit-cover)	16m 29s
check pinned dependencies (google.golang.org/grpc v1.59.0)	4s
run macOS itest	1m 5s
run unit tests (unit tags="kvdb_etcd")	18m 22s
check pinned dependencies (github.com/golang/protobuf v1.5.3)	4s
run unit tests (unit tags="kvdb_postgres")	17m 21s
run unit tests (unit tags="kvdb_sqlite")	16m 21s
check release notes updated	5s
run unit tests (btcd unit-race)	34m 51s
run ubuntu itests (btcd, backend=btcd)	56s
run ubuntu itests (bitcoind, backend=bitcoind)	50s
run windows itest	5m 26s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	48s
run unit tests (unit-module)	56s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	48s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1m 25s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1m 50s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	1m 15s
run ubuntu itests (bitcoind-postgres-nativesql, backend=bitcoind dbbackend=postgres nativesql=true)	1m 56s
run ubuntu itests (bitcoind-sqlite-nativesql, backend=bitcoind dbbackend=sqlite nativesql=true)	1m 14s
run ubuntu itests (neutrino, backend=neutrino)	49s
	2h 23m 35s

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