multi: ensure link is always torn down due to db failures, add expone… #11342

Job	Run time
RPC and mobile compilation check	2m 14s
lint code	7m 10s
cross compilation	13m 53s
sample configuration check	37s
check commits	0s
Sqlc check	20s
check pinned dependencies (google.golang.org/grpc v1.53.0)	4s
check pinned dependencies (github.com/golang/protobuf v1.5.2)	4s
check release notes updated	3s
run ubuntu itests (btcd, backend=btcd)	47m 55s
run ubuntu itests (bitcoind, backend=bitcoind)	1h 4m 8s
run ubuntu itests (bitcoind-notxindex, backend="bitcoind notxindex")	59m 23s
run ubuntu itests (bitcoind-rpcpolling, backend="bitcoind rpcpolling")	1h 2m 14s
run ubuntu itests (bitcoind-etcd, backend=bitcoind dbbackend=etcd)	1h 22m 27s
run ubuntu itests (bitcoind-postgres, backend=bitcoind dbbackend=postgres)	1h 35m 1s
run ubuntu itests (bitcoind-sqlite, backend=bitcoind dbbackend=sqlite)	1h 4m 12s
run ubuntu itests (neutrino, backend=neutrino)	57m 4s
run unit tests (btcd unit-cover)	19m 7s
run unit tests (unit tags="kvdb_etcd")	18m 3s
run unit tests (unit tags="kvdb_postgres")	17m 58s
run unit tests (unit tags="kvdb_sqlite")	8m 4s
run unit tests (btcd unit-race)	43m 47s
run windows itest	16m 52s
	11h 20m 40s

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