use 127.0.0.1 for these tests

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>

libp2pdht/private/eth/p2p/discoveryv5/protocol.nim

@@ -1302,7 +1302,7 @@ proc newProtocol*(
     bootstrapRecords: openArray[SignedPeerRecord] = [],
     previousRecord = none[SignedPeerRecord](),
     bindPort: Port,
-    bindIp = IPv4_any(),
+    bindIp = IPv4_loopback(),
     enrAutoUpdate = false,
     config = defaultDiscoveryConfig,
     rng = newRng(),
@@ -1369,7 +1369,7 @@ proc newProtocol*(
     bindPort: Port,
     record: SignedPeerRecord,
     bootstrapRecords: openArray[SignedPeerRecord] = [],
-    bindIp = IPv4_any(),
+    bindIp = IPv4_loopback(),
     config = defaultDiscoveryConfig,
     rng = newRng(),
     providers = ProvidersManager.new(SQLiteDatastore.new(Memory)

libp2pdht/private/eth/p2p/discoveryv5/transport.nim

@@ -205,7 +205,7 @@ proc newTransport*[T](
   privKey: PrivateKey,
   localNode: Node,
   bindPort: Port,
-  bindIp = IPv4_any(),
+  bindIp = IPv4_loopback(), ## we could use 127.0.0.1 here for local tests
   rng = newRng()): Transport[T]=
 
   # TODO Consider whether this should be a Defect