SPX default socket

By default, for SPX, IBM MQ assumes that the channel will be connected to socket 5E86.

We can change this by:

Add the socket number in brackets as the last part of the ConnectionName:
```
SET  MQSERVER=ChannelName/TransportType/ConnectionName(SocketNumber)
```
For SPX connections, specify the ConnectionName and socket in the form network.node(socket). If the IBM MQ client and server are on the same network, the network need not be specified. If you are using the default socket, the socket need not be specified.
Change the qm.ini file by adding the port number to the protocol name, for example:
```
SPX:
socket=5E87
```