cleanup: documentation and code cleanup for search/getvalue quorum defaulting to zero

dht_test.go

@@ -465,7 +465,7 @@ func TestSearchValue(t *testing.T) {
 
 	ctxT, cancel = context.WithTimeout(ctx, time.Second*2)
 	defer cancel()
-	valCh, err := dhtA.SearchValue(ctxT, "/v/hello", Quorum(-1))
+	valCh, err := dhtA.SearchValue(ctxT, "/v/hello", Quorum(0))
 	if err != nil {
 		t.Fatal(err)
 	}

routing.go

@@ -168,7 +168,7 @@ func (dht *IpfsDHT) SearchValue(ctx context.Context, key string, opts ...routing
 
 	responsesNeeded := 0
 	if !cfg.Offline {
-		responsesNeeded = getQuorum(&cfg, 0)
+		responsesNeeded = getQuorum(&cfg, defaultQuorum)
 	}
 
 	stopCh := make(chan struct{})

routing_options.go

@@ -7,9 +7,10 @@ type quorumOptionKey struct{}
 const defaultQuorum = 0
 
 // Quorum is a DHT option that tells the DHT how many peers it needs to get
-// values from before returning the best one.
+// values from before returning the best one. Zero means the DHT query
+// should complete instead of returning early.
 //
-// Default: 16
+// Default: 0
 func Quorum(n int) routing.Option {
 	return func(opts *routing.Options) error {
 		if opts.Other == nil {