When using new network, the tests use an IPv6-based localhost address for binding and connecting.

The local socket is opened in setUp:

setUp

	listenerSocket := Socket newTCP listenOn: self listenerPort backlogSize: 4 interface: self listenerAddress.

The listenerAddress is derived as follows:

^ NetNameResolver addressForName: 'localhost'

In oldNetwork, that's an IPv4, in !oldNetwork that's an IPv6. this is good

However, the Socket is created as newTCP, that is, explicitely IPv4:

newTCP
	"Create a socket and initialise it for TCP"
	^self newTCP: SocketAddressInformation addressFamilyINET4

This is bad. This is where the Error message comes from.

This should be changed to use the address familty that fits best to the current old/new-network.

On top of that, #listenOn:backlogSize: interface: solely deals with IPv4 adresses.

The correct way is to use the indirection of SocketAddressInformation in #listenWithBacklog:.
This deals correctly with the address family.

Things to do:

• fix the test setup to use the SAI info and/or discriminate old/new network
• maybe Bail in the socket plugin earlier when a new-network socket is used in old-network-ipv4-only code.

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