net_server: fixed configuring disabled interfaces.

* BNetworkSettings now set unspecified addresses to their empty family
  specific addresses, instead of using AF_UNSPEC.
* This allows the net_server to set those addresses on the address
  specific stack interface.

src/kits/network/libnetapi/NetworkSettings.cpp

@@ -196,8 +196,11 @@ get_address_family(const char* argument)
 static bool
 parse_address(int32& family, const char* argument, BNetworkAddress& address)
 {
-	if (argument == NULL)
+	if (argument == NULL) {
+		if (family != AF_UNSPEC)
+			address.SetToWildcard(family);
 		return false;
+	}
 
 	status_t status = address.SetTo(family, argument, (uint16)0,
 		B_NO_ADDRESS_RESOLUTION);

src/servers/net/NetServer.cpp

@@ -504,7 +504,8 @@ NetServer::_ConfigureInterface(BMessage& message)
 		if (!addressSettings.Address().IsEmpty()
 			|| !addressSettings.Mask().IsEmpty()
 			|| !addressSettings.Broadcast().IsEmpty()
-			|| !addressSettings.Peer().IsEmpty()) {
+			|| !addressSettings.Peer().IsEmpty()
+			|| !addressSettings.IsAutoConfigure()) {
 			BNetworkInterfaceAddress interfaceAddress;
 			interfaceAddress.SetAddress(addressSettings.Address());
 			interfaceAddress.SetMask(addressSettings.Mask());