dpnet: fill the DPN_SP_CAPS structure in IDirectPlay8Peer_GetSPCaps with some sane values + tests

[Louis Lenders]

Note: the 2 failing tests on test-bot that this patch will produce, are 
not real failures as winnt and win2000 will not run the test because of 
missing dpnet

This let's RC Cars Demo proceed tiny bit further to run into the next problem: IDirectPlay8Peer_EnumHosts.
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