swarm: fix flaky delivery tests (ethereum#18971)

(cherry picked from commit 592bf6a)

swarm/network/stream/delivery.go

@@ -259,13 +259,6 @@ func (d *Delivery) RequestFromPeers(ctx context.Context, req *network.Request) (
 			if sp == nil {
 				return true
 			}
-			// nodes that do not provide stream protocol
-			// should not be requested, e.g. bootnodes
-			if !p.HasCap("stream") {
-				// TODO: if we have no errors, delete this if
-				log.Error("Delivery.RequestFromPeers: peer doesn't have stream cap. we should have returned at sp == nil")
-				return true
-			}
 			spID = &id
 			return false
 		})

swarm/network/stream/delivery_test.go

@@ -285,7 +285,7 @@ func TestRequestFromPeers(t *testing.T) {
 	addr := network.RandomAddr()
 	to := network.NewKademlia(addr.OAddr, network.NewKadParams())
 	delivery := NewDelivery(to, nil)
-	protocolsPeer := protocols.NewPeer(p2p.NewPeer(dummyPeerID, "dummy", []p2p.Cap{{Name: "stream"}}), nil, nil)
+	protocolsPeer := protocols.NewPeer(p2p.NewPeer(dummyPeerID, "dummy", nil), nil, nil)
 	peer := network.NewPeer(&network.BzzPeer{
 		BzzAddr:   network.RandomAddr(),
 		LightNode: false,