swarm: bootnode-mode, new bootnodes and no p2p package discovery (#18498)

(cherry picked from commit bbd120354a)

p2p/protocols/protocol.go

@@ -423,3 +423,17 @@ func (p *Peer) Handshake(ctx context.Context, hs interface{}, verify func(interf
 	}
 	return rhs, nil
 }
+
+// HasCap returns true if Peer has a capability
+// with provided name.
+func (p *Peer) HasCap(capName string) (yes bool) {
+	if p == nil || p.Peer == nil {
+		return false
+	}
+	for _, c := range p.Caps() {
+		if c.Name == capName {
+			return true
+		}
+	}
+	return false
+}