expire lockers if lockers are offline (#10749)

lockers currently might leave stale lockers,
in unknown ways waiting for downed lockers.

locker check interval is high enough to safely
cleanup stale locks.

pkg/dsync/drwmutex.go

@@ -241,6 +241,7 @@ func lock(ctx context.Context, ds *Dsync, locks *[]string, id, source string, is
 				UID:       id,
 				Resources: lockNames,
 				Source:    source,
+				Quorum:    quorum,
 			}
 
 			var locked bool

pkg/dsync/rpc-client-interface.go

@@ -33,6 +33,9 @@ type LockArgs struct {
 	// Owner represents unique ID for this instance, an owner who originally requested
 	// the locked resource, useful primarily in figuring our stale locks.
 	Owner string
+
+	// Quorum represents the expected quorum for this lock type.
+	Quorum int
 }
 
 // NetLocker is dsync compatible locker interface.